Re: [CentOS] Cluster server options?

[John R Pierce]

nate wrote:
> http://www.theregister.co.uk/2009/11/04/scalemp_vsmp_smb_cloud/
> Is the only product I've heard of that claims to do what your
> aiming for.
>   

um, that just does away with the expensive infiniband switch in favor of 
an infiniband 'loop' architecture (eg, each host still uses an 
infiniband adapter), and virtualizes the switch.

this is simply a cost reducing measure in building conventional HP 
clustering where infiniband is often used for interprocess message 
passing because of its high performance and low latency.

you still need to program for a message passing environment and break 
your workload down into small chunks that can run independently


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Re: [CentOS] Cluster server options?

[John R Pierce]

Bent Terp wrote:
>> 2 minutes of frantic googling led to this project:
>> http://www.kerrighed.org which at least seems to be alive, but I
>> haven't tried it myself.
>> 
> You might also want to look at this one: http://www.xtreemos.org/
>   

those are both grid solutions.  as any high performance clustering 
solution inherently must be.  You still have to program with MPI or 
anther grid-oriented programming methodology and break your workload up 
into parallel chunks

The OP specifically stated he wants his cluster to function as a single 
processor, so a single conventionally written (and presumably 
single-threaded)  program would run faster, and thats just not possible.


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Re: [CentOS] Cluster server options?

[John R Pierce]

Scott Ehrlich wrote:
> I have a 10 blade cluster of just hardware - I can install what I
> want, how I want.   What options are there if I wanted to build the 10
> blades as one large beast, but _NOT_ necessarily for someone doing
> grid-type work?Some users don't now how to program that way, but
> they'd like to have their program run on something that acts like a
> single processor, but a massive single processor with lots of memory.
>  Some code is designed for a single, powerful workstation.  I'd like
> this cluster to act as one powerful workstation.
>   

9 women can't make a baby in one month.


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Re: [CentOS] Cluster server options?

[Bent Terp]

On Mon, Nov 9, 2009 at 7:12 AM, Bent Terp  wrote:
> On Sat, Nov 7, 2009 at 7:57 PM, Scott Ehrlich  wrote:
>>  Some code is designed for a single, powerful workstation.  I'd like
>> this cluster to act as one powerful workstation.
>
> I was going to suggest OpenMOSIX but that turned out to be quite dead :-(
>
> 2 minutes of frantic googling led to this project:
> http://www.kerrighed.org which at least seems to be alive, but I
> haven't tried it myself.
>
You might also want to look at this one: http://www.xtreemos.org/

BR Bent
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Re: [CentOS] GUID Partition Tables and Ext3 Partition Size

[Phil Manuel]

Manish Kathuria wrote:
>
>
> Thanks Phil. I had seen that site before and I wanted to know the
> status on the current CentOS kernels. Are you running CentOS 5.x and
> using LVM for this partition or have you formatted it as ext3
> filesystem directly ?
>
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We are using ext4 with lvm for this partition as we know it will need to 
increase.

Phil.
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Re: [CentOS] Cluster server options?

[Bent Terp]

On Sat, Nov 7, 2009 at 7:57 PM, Scott Ehrlich  wrote:
>  Some code is designed for a single, powerful workstation.  I'd like
> this cluster to act as one powerful workstation.

I was going to suggest OpenMOSIX but that turned out to be quite dead :-(

2 minutes of frantic googling led to this project:
http://www.kerrighed.org which at least seems to be alive, but I
haven't tried it myself.

with kind regards,
  Bent Terp
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Re: [CentOS] GUID Partition Tables and Ext3 Partition Size

[Manish Kathuria]

On Mon, Nov 9, 2009 at 10:26 AM, Phil Manuel  wrote:
> This might help http://en.wikipedia.org/wiki/GUID_Partition_Table
>
> We certainly have a GPT partition of 15Tb but I know it can go much larger.
>
> Phil.
>

Thanks Phil. I had seen that site before and I wanted to know the
status on the current CentOS kernels. Are you running CentOS 5.x and
using LVM for this partition or have you formatted it as ext3
filesystem directly ?

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Re: [CentOS] How Can I change CentOS CLI Screen Resolution to smaller text (without GUI)?

[Sam Acosta]

Thanks for the inputs guys...

But how could I reload the grub config file after boot.  Of course, I just
could easily re-start our server without prior scheduling...

Sam

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On Mon, Nov 9, 2009 at 10:35 AM, Robert Spangler wrote:

> On Sunday 08 November 2009 20:59, Sam Acosta wrote:
>
> >  I'd like to view the Screen resolution in smaller text on my server
> >  terminal.  The server is not installed with any GUI so it's in plain
> text
> >  mode.
>
> Try adding 'vga=795' to the end of the kernel line in grub.conf file.
>
>
> --
>
> Regards
> Robert
>
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Re: [CentOS] GUID Partition Tables and Ext3 Partition Size

[Phil Manuel]

This might help http://en.wikipedia.org/wiki/GUID_Partition_Table

We certainly have a GPT partition of 15Tb but I know it can go much larger.

Phil.

Manish Kathuria wrote:
> Hello,
>
> Does CentOS 5.4 support large ( > 2 TB) external storage devices using
> GPT (GUID Partition Tables), while the main OS resides on smaller hard
> disks using MBR. In this scenario, what can be the largest possible
> size of an ext3 partition (and filesystem) which can be created on the
> storage array under CentOS 5.4 ?
>
> Thanks,
>
> Manish
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[CentOS] GUID Partition Tables and Ext3 Partition Size

[Manish Kathuria]

Hello,

Does CentOS 5.4 support large ( > 2 TB) external storage devices using
GPT (GUID Partition Tables), while the main OS resides on smaller hard
disks using MBR. In this scenario, what can be the largest possible
size of an ext3 partition (and filesystem) which can be created on the
storage array under CentOS 5.4 ?

Thanks,

Manish
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Re: [CentOS] errors on multimedia guidance for x86_64

[David McGuffey]

On Sat, 2009-11-07 at 20:44 -0500, David McGuffey wrote:
> I have a fresh install of 5.4 x86_64 from a dvd .iso.  All has worked
> well for several days, including kvm and WinXP running in a vm.
> 
> Decided it was time to get the multimedia stuff up and running so I
> could listen to music CDs and watch DVD movies while working.  I
> followed the guidance on the "Tips and Tricks" page for multimedia. Had
> no problem with the "priorities" or the rpmforge installs.  Here is
> where it went south:
> 
> [r...@desk Desktop]# yum install libdvdcss libdvdread libdvdplay
> libdvdnav lsdvd mplayerplug-in mplayer mplayer-gui compat-libstdc++-33
> flash-plugin gstreamer-plugins-bad gstreamer-plugins-ugly
> gstreamer-ffmpeg libquicktime
> Loaded plugins: fastestmirror, priorities
> Loading mirror speeds from cached hostfile
>  * addons: yum.singlehop.com
>  * base: mirror.fdcservers.net
>  * extras: mirrors.liquidweb.com
>  * rpmforge: fr2.rpmfind.net
>  * updates: centos.mirror.nac.net
> 440 packages excluded due to repository priority protections
> Setting up Install Process
> 
> ...
> 
> --> Finished Dependency Resolution
> gstreamer-plugins-bad-0.10.8-3.el5.rf.x86_64 from rpmforge has
> depsolving problems
>   --> Missing Dependency: libfaad.so.0()(64bit) is needed by package
> gstreamer-plugins-bad-0.10.8-3.el5.rf.x86_64 (rpmforge)
> libquicktime-1.1.3-1.el5.rf.x86_64 from rpmforge has depsolving problems
>   --> Missing Dependency: libfaad.so.0()(64bit) is needed by package
> libquicktime-1.1.3-1.el5.rf.x86_64 (rpmforge)
> Error: Missing Dependency: libfaad.so.0()(64bit) is needed by package
> libquicktime-1.1.3-1.el5.rf.x86_64 (rpmforge)
> Error: Missing Dependency: libfaad.so.0()(64bit) is needed by package
> gstreamer-plugins-bad-0.10.8-3.el5.rf.x86_64 (rpmforge)
>  You could try using --skip-broken to work around the problem
>  You could try running: package-cleanup --problems
> package-cleanup --dupes
> rpm -Va --nofiles --nodigest
> The program package-cleanup is found in the yum-utils package.
> [r...@desk Desktop]# 
> 
> First question: Is the guidance for multimedia accurate for an 5.4
> x86_64 load?
> 
> Second question: is rpmforge fully ready for 5.4?
> 
> Dave
> 
bump

So...are the gstreamer-plugins in rpmforge ready for 5.4?

DaveM


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Re: [CentOS] Virtualization option at first install CentOS-5.4 x86_64

[David McGuffey]

On Sun, 2009-11-08 at 14:50 +0100, Mathieu Baudier wrote:
> > I've been doing a lot of research on virtualization (VMWare, EXSi, xen,
> > kvm, VirtualBox, etc.) and ended up choosing kvm.  I'm very surprised at
> > how quick I was able to bring up a WinXP VM.
> >
> 
> # FUTURE OF KVM
> David, I'm currently doing exactly the same (researching and comparing
> various virtualization technologies) and I agree that it seems the way
> to go in the future.
> 
> Only "problem" is that virt-manager is pretty hard to use and lacks a
> lot of features which would be practical. It is better though when
> using the one in Fedora, connecting to a CentOS box running
> libvirtd+KVM.
> What esp. lacks in the virt-manager distributed with CentOS 5.4 is the
> remote management of storage pools. I guess that the upstream vendor
> want to keep its proprietary Virtualization Server product
> attractive... (which is in itself a guarantee that they will keep
> investing in KVM, see: http://www.redhat.com/v/swf/rhev/demo.html)
> 
> # WIN XP UNDER QEMU+KVM
> Regarding running Windows XP, I just wanted to share the following
> with the list:
> - when installing Windows XP through virt-manager, if one chooses
> 'Windows XP' as OS type and chooses more than 1 virtual CPU, some or
> all of the physical CPUs are used to 100% and the guest is very slow
> - this seems to be due to a problem where ACPI is not properly
> activated: https://bugs.launchpad.net/ubuntu/+source/virt-manager/+bug/228442
> - the solution is to install it as 'Windows Vista': in that case this
> is indeed extremely fast, and actually I do not have the pb described
> in the link above that it cannot shutdown.
> 
> I'm gathering experience around KVM and I'll probably try to
> contribute it to the CentOS Wiki when it is more consolidated.
I selected one virtual CPU for the XP load...primarily because I want to
run a couple more VMs and the guidance was to allocate one real CPU per
VM.

So far, I'm very impressed with kvm.  However, I'm getting an SELinux
alert on qemu, and have posted the sealert txt to the selinux-list for
resolution. The VM seems to run ok, but I must do so as root, and not a
regular user. kvm+qemu on CentOS is supposed to be able to be run as a
regular user.  The SELinux alert seems to revolve around the admin type
(or lack thereof). I'm hoping the SELinux gurus can work it out.

In the meantime, I need to figure out how to get the XP VM to access a
usb thumbdrive.


DaveM


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Re: [CentOS] How Can I change CentOS CLI Screen Resolution to smaller text (without GUI)?

[Robert Spangler]

On Sunday 08 November 2009 20:59, Sam Acosta wrote:

>  I'd like to view the Screen resolution in smaller text on my server
>  terminal.  The server is not installed with any GUI so it's in plain text
>  mode.

Try adding 'vga=795' to the end of the kernel line in grub.conf file.


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Re: [CentOS] How Can I change CentOS CLI Screen Resolution to smaller text (without GUI)?

[Barry Brimer]

> Hi,
>
> I'd like to view the Screen resolution in smaller text on my server
> terminal.  The server is not installed with any GUI so it's in plain text
> mode.

Google for linux vga modes

Barry
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[CentOS] How Can I change CentOS CLI Screen Resolution to smaller text (without GUI)?

[Sam Acosta]

Hi,

I'd like to view the Screen resolution in smaller text on my server
terminal.  The server is not installed with any GUI so it's in plain text
mode.

Thanks.

Sam

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Re: [CentOS] Some basic LVM questions

[Kwan Lowe]

On Sun, Nov 8, 2009 at 1:22 AM, Monte Milanuk  wrote:
[...]
>
> What I have currently is an older PC that I'm hoping to use as a home server
> / occasional 'workstation'.  One 13GB main drive, and a 500GB drive for
> network storage.  The default install in CentOS 5.4 seems to want to just
> lump everything together in one big volume.  I was thinking perhaps it'd be
> better to have two volumes (or pools, like I said - still learning and not
> entirely confident of the lingo involved)... one for the main or 'system'
> drive (the 13GB one with / mounted on it), and another one for the 500GB
> sata drive on it - so if I want to add another big drive for more storage,
> it'd go under that group, ready to serve up storage to the WLAN.
>
> Is there anything particularly 'wrong' with that layout, as compared to the
> default 'everything in one logical volume' approach that the installer
> utilized?

Nothing wrong with it and I would certainly recommend that you
separate the data volumes from the OS volumes.  In the very least it
will allow you to move the data drive to another system and bring it
online. And yes, if you lose a single drive in a non-RAIDed LVM group,
you can lose the whole volume. If there's data that is absolutely
critical, you can put it on an LVM RAID or at least mirror it.  This
said, having even a single drive in an LVM VG can be beneficial.  For
example:

1) Adding space is as simple as adding another drive to the VG.

2) If you later want to mirror the drive, just add another drive and
mirror the LV.

3) If you run out of space, you can add a larger drive then migrate
the PVs from the original drive to the new, larger drive. This also
works if the original drive is starting to fail.

4) You can create LV snapshots easily which is very useful for backups.
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Re: [CentOS] mirrorlist for 5.4

[Markus Falb]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

Karanbir Singh wrote:
> On 08/11/09 22:46, Markus Falb wrote:
>> What i was trying to ask is:
>> is it per purpose that there is a "release=5" and "release=5.3" is
>> working but not "release=5.4" or in other words
> 
> '5.3' is only working since it hasent been moved away to vault.c.o as 
> yet, which will happen during this week. at which point only 
> releasever=5 will work.
> 
> Also, we hope to change the whole stack of code that runs behind this 
> mirrorlist and mirror management stuff during the next couple of months. 
> in my opinion, having a subrelease like 5.2 or 5.3 work is only going to 
> lead to people with orphaned setups - unless we support a longterm 5.2 
> or 5.3 release - which we dont.
> 

Dont misunderstand me, please. I was about to take care of your (CentOS)
bandwidth. And, my feeling is that my setups are my cup of tea.

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Re: [CentOS] connection refused resolving - after 5.4 upgrade

[Rob Kampen]

Rob Kampen wrote:

Hi all,
prior to 5.4 upgrade, my two DNS servers would only get
'connection refused resolving .'
on rare infrequent occasions (once or twice a month)
after upgrade to 5.4 I get 500+ per day.
Google has suggestions for
|logging
  category lame-servers null; ;
;

|however this strikes me as severe overkill as it will mask genuine 
problems.

Anyone else noticed this?
Suggestions as to why or what is causing?
Thanks
Rob

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bumping my post as I am getting a growing number of errors - they seem 
to occur each hour and from google and reading other posts this appears 
to be due to my amavis / spamasassin seeing the log messages and 
creating a loop.
The question I have is how do I locate the actual trigger - I prefer to 
fix things at the cause, not mask somewhere down-stream.
The only item I can see is the log message coming from named in my 
messages log.

Any ideas appreciated - TIA
Rob
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Re: [CentOS] mirrorlist for 5.4

[Karanbir Singh]

On 08/11/09 22:46, Markus Falb wrote:
> What i was trying to ask is:
> is it per purpose that there is a "release=5" and "release=5.3" is
> working but not "release=5.4" or in other words

'5.3' is only working since it hasent been moved away to vault.c.o as 
yet, which will happen during this week. at which point only 
releasever=5 will work.

Also, we hope to change the whole stack of code that runs behind this 
mirrorlist and mirror management stuff during the next couple of months. 
in my opinion, having a subrelease like 5.2 or 5.3 work is only going to 
lead to people with orphaned setups - unless we support a longterm 5.2 
or 5.3 release - which we dont.

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Re: [CentOS] Some basic LVM questions

[Dave Stevens]

Quoting Monte Milanuk :

> M. Hamzah Khan wrote:
>> On Sun, 2009-11-08 at 10:44 -0800, Monte Milanuk wrote:
>>
>> What I think most people do (and what I am doing now), is to setup
>> RAID-1 or so behind the volume group. This way you will still be safe if
>> one of the drives fail. Keep in mind that RAID is not a backup solution,
>> and you should still create regular backups. :)
>>
>
> In practical terms, it may all be a moot point.  I'm not too sure how
> much more I can jam in that mini-tower case without other problems, and
> (hopefully) 500GB should be enough storage for now; intended usage is
> just backing up users home directories from a few PCs & laptops in the
> house.  If I truly intend to implement LVM + RAID it may have to be in a
> newer dedicated setup.  I think for the time being though, I will look
> at removing the 500gb drive from the first volume group and creating a
> second one with just it in there.  Who knows, I might get brave and
> start mucking about w/ software raid and see what I can put together ;)
>
> I know everyone says RAID is not substitute for a proper backup
> solution... but this machine *is* the backup for the rest of the
> network.  At what point should one draw the line for backing up?  What
> is there out there that is still reasonably economical for backing up
> say, a RAID 1 setup of two 1TB drives, or a RAID 5 setup of three drives
> that size?  Tape?  Looks to be just about out-stripped in size by cheap
> hard drives, at least in anything even remotely in my price range.  NAS
> - which is probably going to have its own version of RAID?

well, I'm dealing with this right now, I've taken delivery of a pile  
of parts that will be a new server Real Soon Now (TM). The four 750  
drives will be a sw RAID 0+1 array with striping for performance and  
mirroring for redundancy. There will be an identical 5th drive in the  
box and not connected as a spare for 1 drive failure. Then there will  
be an off-site 1.5T in another box doing rsync as the last line of  
backup. The reason for sw raid is that I get to use eight opteron  
cores rather than the dinky cpu on a raid card and that I don't need  
to be concerned that a replacement raid controller might have a  
different BIOS than the one I started with.

HTH

Dave



> Thanks,
>
> Monte
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Re: [CentOS] Some basic LVM questions

[Kai Schaetzl]

Monte Milanuk wrote on Sun, 08 Nov 2009 14:13:17 -0800:

> In practical terms, it may all be a moot point.  I'm not too sure how 
> much more I can jam in that mini-tower case without other problems, and 
> (hopefully) 500GB should be enough storage for now; intended usage is 
> just backing up users home directories from a few PCs & laptops in the 
> house.  If I truly intend to implement LVM + RAID it may have to be in a 
> newer dedicated setup.  I think for the time being though, I will look 
> at removing the 500gb drive from the first volume group and creating a 
> second one with just it in there.  Who knows, I might get brave and 
> start mucking about w/ software raid and see what I can put together ;)

For your purposes you could just go without LVM. Just mount disk 1 as / and 
disk 2 as /var or /home - depending where you need most of the space.

Kai

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Re: [CentOS] mirrorlist for 5.4

[Markus Falb]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

Markus Falb wrote:
> Kai Schaetzl wrote:
> 
> I have machines with 5.3 and machines with 5.4 and therefore I need a
> local mirror for 5.3
> If i mirror release=5 i destroy the 5.3 mirror.
> Anyway, I was not asking "Am I wrong"
> 

What i was trying to ask is:
is it per purpose that there is a "release=5" and "release=5.3" is
working but not "release=5.4" or in other words

is the url
http://mirrorlist.centos.org/?release=5.4&arch=x86_64&repo=os
not supposed to work ? Then I can work around it. I dont have to use
mirrorlist. I could use http://mirror.centos.org/centos-5/5.4/ or some
other mirror, but why hardcode when theres a mirrorlist system ?


- --
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markus
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Re: [CentOS] mirrorlist for 5.4

[Markus Falb]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

Kai Schaetzl wrote:
> Markus Falb wrote on Sun, 8 Nov 2009 18:20:14 + (UTC):
> 
>> In my Experience it is not always possible to upgrade all machines to the 
>> newest and shiniest OS out there. Not within the first week at least. So 
>> I have to maintain machines with 5.3 and machines with 5.4 and ...
>> My argument is that i do not want have Updates offered that are not 
>> appropriate.
> 
> So, what? There are no updates for 5.3 anymore. And 5.4=5 at the moment.
> Read the FAQs, basic CentOS stuff: 
> http://www.centos.org/modules/smartfaq/faq.php?faqid=34

Yes, but 5!=5.4

I have machines with 5.3 and machines with 5.4 and therefore I need a
local mirror for 5.3
If i mirror release=5 i destroy the 5.3 mirror.
Anyway, I was not asking "Am I wrong"

> 
> It would readability if you could stop quoting all the URL garbage again and 
> again. Thanks.

I know that and i am very sorry. Sometimes I act to quick and forget to
snippel away unwanted stuff. From time to time this happened and it will
happen again I fear, i am not programmed and no machine. Sorry again.


- --
bests regards,
markus
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Re: [CentOS] mirrorlist for 5.4

[Markus Falb]

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Simon Wesp wrote:
> Am Sonntag, den 08.11.2009, 18:20 + schrieb Markus Falb: 
>> I know that release=5 is working, but this is not what i want.
> really? think about again, please!

Aha...

> 
>> In my Experience it is not always possible to upgrade all machines to the 
>> newest and shiniest OS out there. 
> This is not a distro like Whatever-Badbuntu. There *can* be problems,
> but I never had a problem with updating x.n to x.n+1 or x.n+2.. 

But if there *can* be problems, whats your point then ? I read the
Release Notes and there are some known listed problems and if a listed
problem is applicable to one or more of my machines i can not upgrade
without further thougths. Anyway, why do you suppose i am a Ubuntu User ?

> 
>> I have to maintain machines with 5.3 and machines with 5.4 and ...
> shouldn't be a problem.
> 
>> My argument is that i do not want have Updates offered that are not 
>> appropriate.
> This isn't an argument, this is ignorance. 90% of all updates are fixes
> of bugs and security-issues.

I do not want to ignore Updates, I do want to decide if a update is safe
or possible or (sometimes) even necessary for a given machine. Possibly
doing blindly Updates is ignorant. I agree that 90% of the updates are
kind of No Brainers. Whats with the rest ?

Have a look into the Release Notes, there are known issues. I know there
often are Solutions, Workarounds, but thats not the point. What I want
to say, there *can* and there *are* issues at times.

I dont want a Monitoring System going crazy about pending Updates.

If I have an old release running (whatever the reason may be) i need to
be able to install an old release of CentOS, Packages from the old
release and so on, so I need an old version lying around. All that
requires the possibility to mirror by exact release (or am i blind ?). ?
I was not saying: I dont want that Update stuff.

All that said, i think there are situations where exact release
versioning is necessary.

- --
bests regards,
markus
Die Lage: Um die 8 Grad in Wien und mittlerweile trocken.
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Re: [CentOS] Some basic LVM questions

[Monte Milanuk]

M. Hamzah Khan wrote:
> On Sun, 2009-11-08 at 10:44 -0800, Monte Milanuk wrote:
>
> What I think most people do (and what I am doing now), is to setup
> RAID-1 or so behind the volume group. This way you will still be safe if
> one of the drives fail. Keep in mind that RAID is not a backup solution,
> and you should still create regular backups. :)
>   

In practical terms, it may all be a moot point.  I'm not too sure how 
much more I can jam in that mini-tower case without other problems, and 
(hopefully) 500GB should be enough storage for now; intended usage is 
just backing up users home directories from a few PCs & laptops in the 
house.  If I truly intend to implement LVM + RAID it may have to be in a 
newer dedicated setup.  I think for the time being though, I will look 
at removing the 500gb drive from the first volume group and creating a 
second one with just it in there.  Who knows, I might get brave and 
start mucking about w/ software raid and see what I can put together ;)

I know everyone says RAID is not substitute for a proper backup 
solution... but this machine *is* the backup for the rest of the 
network.  At what point should one draw the line for backing up?  What 
is there out there that is still reasonably economical for backing up 
say, a RAID 1 setup of two 1TB drives, or a RAID 5 setup of three drives 
that size?  Tape?  Looks to be just about out-stripped in size by cheap 
hard drives, at least in anything even remotely in my price range.  NAS 
- which is probably going to have its own version of RAID?

Thanks,

Monte
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Re: [CentOS] mirrorlist for 5.4

[Kai Schaetzl]

Markus Falb wrote on Sun, 8 Nov 2009 18:20:14 + (UTC):

> In my Experience it is not always possible to upgrade all machines to the 
> newest and shiniest OS out there. Not within the first week at least. So 
> I have to maintain machines with 5.3 and machines with 5.4 and ...
> My argument is that i do not want have Updates offered that are not 
> appropriate.

So, what? There are no updates for 5.3 anymore. And 5.4=5 at the moment.
Read the FAQs, basic CentOS stuff: 
http://www.centos.org/modules/smartfaq/faq.php?faqid=34

It would readability if you could stop quoting all the URL garbage again and 
again. Thanks.

Kai

-- 
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Re: [CentOS] mirrorlist for 5.4

[Simon Wesp]

Am Sonntag, den 08.11.2009, 18:20 + schrieb Markus Falb: 
> I know that release=5 is working, but this is not what i want.
really? think about again, please!

> In my Experience it is not always possible to upgrade all machines to the 
> newest and shiniest OS out there. 
This is not a distro like Whatever-Badbuntu. There *can* be problems,
but I never had a problem with updating x.n to x.n+1 or x.n+2.. 

> I have to maintain machines with 5.3 and machines with 5.4 and ...
shouldn't be a problem.

> My argument is that i do not want have Updates offered that are not 
> appropriate.
This isn't an argument, this is ignorance. 90% of all updates are fixes
of bugs and security-issues.

> Liebe Grüße aus dem verregnetem Wien ;-)

-- 
Mit freundlichen Grüßen aus dem schönen regenfreien, aber verdammt kalten 
Hainzell
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Re: [CentOS] Some basic LVM questions

[Eduardo Grosclaude]

On Sun, Nov 8, 2009 at 4:44 PM, Monte Milanuk  wrote:

> M. Hamzah Khan wrote:
> > With both drives in one big volume group, failure of one drive will
> > (most likely) cause both the OS and data to be lost.
> >
> There in lies some of my confusion with this subject; correct me if I'm
> wrong in my understanding here: with LVM, I can keep adding more drives
> to a 'pool' and expand the size of the 'volume' that the OS sees
> available to it... but if any drive in that volume fails, I'd probably
> lose everything stored in that volume?!?  Sounds like a somewhat risky
> business to me, unless you *really* needed a storage volume that big
> that you had to span multiple drives to do so.
>

You are right. LVM sort of factors out the disk reliability issue. That's
why you should consider to allow volumes that span across disks on RAIDed-1
disks only.


-- 
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Universidad Nacional del Comahue
Neuquen, Argentina
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Re: [CentOS] Some basic LVM questions

[M. Hamzah Khan]

On Sun, 2009-11-08 at 10:44 -0800, Monte Milanuk wrote:
> M. Hamzah Khan wrote:
> > There won't be any issue in doing this. The installer just tries to make
> > things easier by creating one big volume group.
> >
> > I'd say that in some ways seperating the two disks in this case would
> > actually be better. :)
> >   
> My last 'serious' experience with Linux was some years ago... mostly 
> before LVM really became popular (it was out and about, but mostly only 
> in SuSE).  I'm still 'stuck' in the mind set of a main drive or 
> partition for things like '/', possibly even /boot, /var, /usr, etc. and 
> then keeping /home separate - mainly so the user data in /home survives 
> upgrades and updates and such ;)

I actually ran into this recently too! 3TB volume group, with very old
backups, and no RAID. One drive failed, almost lost all of the data. I
had to send the drives off to a data recovery center and get the data
recovered professionally.

> > With both drives in one big volume group, failure of one drive will
> > (most likely) cause both the OS and data to be lost. 
> >   
> There in lies some of my confusion with this subject; correct me if I'm 
> wrong in my understanding here: with LVM, I can keep adding more drives 
> to a 'pool' and expand the size of the 'volume' that the OS sees 
> available to it... but if any drive in that volume fails, I'd probably 
> lose everything stored in that volume?!?  Sounds like a somewhat risky 
> business to me, unless you *really* needed a storage volume that big 
> that you had to span multiple drives to do so.
> 

That is correct. You can add more drives and expand the volume group in
order to increase the size of your logical volumes. Losing one drive
would indeed cause all your data in the volume group to be lost
(although there are some situations where it isn't too difficult to
recover some of the data). 

What I think most people do (and what I am doing now), is to setup
RAID-1 or so behind the volume group. This way you will still be safe if
one of the drives fail. Keep in mind that RAID is not a backup solution,
and you should still create regular backups. :)

> > Seperating them will mean that if your OS drive fails you can replace
> > the dead drive, reinstall CentOS (or restore from a backup), and your
> > data will be accessible again.
> >   
> Kind of what I had in mind, as the 13GB drive is much older (circa 2005, 
> if its the original one put in when the previous owner built the box 
> from a bare-bones kit) than the 500GB SATA drive (earlier this year, 
> when I stuck it in there) so if I had to put money on one failing before 
> the other... ;)
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Email: ham...@hamzahkhan.com
URL: http://www.hamzahkhan.com
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Re: [CentOS] Net-SNMP interfaces out of order

[Eduardo Grosclaude]

On Sat, Nov 7, 2009 at 9:40 PM, Bob p...@nle  wrote:

> Hello Centos People,
>
> I have a CentOS 5.3 box that had a total of 5 ethernet cards in it.  It
> functions to share an internet connection with 4 different subnets.  All
> works fine, except I'm noticing that my MRTG traffic graphs are wrong.
> Further digging with snmpwalk reveal that the order of the ethernet
> interfaces changes every time the machine is rebooted to a different order.
>
> For example, I currently see:
>
> IF-MIB::ifDescr.1 = STRING: lo
> IF-MIB::ifDescr.2 = STRING: eth3
> IF-MIB::ifDescr.3 = STRING: eth4
> IF-MIB::ifDescr.4 = STRING: eth0
> IF-MIB::ifDescr.5 = STRING: eth1
> IF-MIB::ifDescr.6 = STRING: eth2
> IF-MIB::ifDescr.7 = STRING: sit0
>
> Why is this not in proper order?  Other servers seem to be ok.  my
> snmpd.conf file has little, if anything as far as config.  Is there
> something I need to put in there for persistence?
>
>
I have found that relying on snmp numbers for interfaces is always tricky.
You may be better off addressing them by 'description' as in

Target[mytarget]: \ppp0:pub...@localhost

in your mrtg.cfg. Check
http://oss.oetiker.ch/mrtg/doc/mrtg-reference.en.html for the whole story.
HTH

-- 
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Universidad Nacional del Comahue
Neuquen, Argentina
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Re: [CentOS] Centos as a file storage/backup destination (Advice)

[John R Pierce]

Craig White wrote:
> agreed but I am not a fan of RAID-5 any more because it is so slow.
> Suggest RAID 10/0+1
>   

generally, I'd agree, but for bulk storage like a backup server, the 
drive count gets kind of higher.

http://www.supermicro.com/products/chassis/3U/936/SC936E1-R900.cfm   
would be the way to go then.   I'd probably use one raid1 of 2 drives 
for the OS and software, then 12 as a raid 0+1 and 1-2 hot spares


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Re: [CentOS] Centos as a file storage/backup destination (Advice)

[Les Mikesell]

Roland Roland wrote:
> Hello all,
> 
> am considering setting up centos as a file storage/ backup destination 
> for Mac's TimeMachine.
> 
> all my users would get synced directly to specific folders on this machine..
> needless to say space is of importance. where every user has an average 
> 200 GB of data to b synced (entire system)...
> I have 27 users hence 27 *200 equals to almost 6 TB so I was considering 
> getting either 4 * 1.5 TB or 6 * 1 TB to be used on one PIV with a 1 GB 
> ethernet.
>  
> but the thing is, I'm an expert with this! so I'm seeking your help..
> is there any other way to do so ? is there any limitation 
> hardware/centos wise for the amount of drives available on a system?
> is Motherboard available sata/ide slots is the only limitation? how 
> about using a USB hub and plugging them as such?
>  
> any advice is greatly appreciated Smile emoticon
>  
>  
> thanks and excuse my newbie question.

Does every user have a unique 200GB or is there a large amount of duplication? 
If most of the content is duplicated, you might look at using backuppc instead 
of time machine because it will find matching content and pool it with hard 
links - and it compresses files for additional space saving.  It is a little 
more trouble to set up and there are some quirks with mac files, but it might 
be 
worth it.

As for space, I'd get a big tower case and a pci-X or -E controller card like 
this: http://www.newegg.com/Product/Product.aspx?Item=N82E16815121009.

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Re: [CentOS] Centos as a file storage/backup destination (Advice)

[Craig White]

On Sun, 2009-11-08 at 10:26 -0800, John R Pierce wrote:
> Roland Roland wrote:
> > Hello all,
> >
> > am considering setting up centos as a file storage/ backup destination 
> > for Mac's TimeMachine.
> >
> > all my users would get synced directly to specific folders on this 
> > machine..
> > needless to say space is of importance. where every user has an 
> > average 200 GB of data to b synced (entire system)...
> > I have 27 users hence 27 *200 equals to almost 6 TB so I was 
> > considering getting either 4 * 1.5 TB or 6 * 1 TB to be used on one 
> > PIV with a 1 GB ethernet.
> 
> I would think you should use raid for this, at least raid 5, which 
> requires N+1 for N drives worth of storage.  and you probably want a 
> hotspare in case a drive fails.
> 
> >  
> > but the thing is, I'm an expert with this! so I'm seeking your help..
> > is there any other way to do so ? is there any limitation 
> > hardware/centos wise for the amount of drives available on a system?
> > is Motherboard available sata/ide slots is the only limitation? how 
> > about using a USB hub and plugging them as such?
> >  
> 
> USB drives are quite slow, you want to use SATA for this.   you can get 
> PCI-E sata expansion cards, ideally on PCI-E x4 slots which have 
> sufficient bandwidth (pci-e x1 would be a bottleneck for more than a 
> couple drives)
> 
> I'd  suggest getting a 'storage server' with sufficient drive bays and 
> channels for what you're doing.
> 
> a server like 
> http://www.asaservers.com/config.asp?config_id=ASA4002-X2Q-S2-S holds 8 
> hotswap drive bays and is quite customizable.

agreed but I am not a fan of RAID-5 any more because it is so slow.
Suggest RAID 10/0+1

Also, you probably are going to have partition off each user because
Time Machine will claim up to 2 TB each instance as sparse files and if
you don't partition, you will find the first ones to setup will claim a
lot more space than you had intended. Do some research into how Time
Machine actually operates.

Craig


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Re: [CentOS] Some basic LVM questions

[Monte Milanuk]

M. Hamzah Khan wrote:
> There won't be any issue in doing this. The installer just tries to make
> things easier by creating one big volume group.
>
> I'd say that in some ways seperating the two disks in this case would
> actually be better. :)
>   
My last 'serious' experience with Linux was some years ago... mostly 
before LVM really became popular (it was out and about, but mostly only 
in SuSE).  I'm still 'stuck' in the mind set of a main drive or 
partition for things like '/', possibly even /boot, /var, /usr, etc. and 
then keeping /home separate - mainly so the user data in /home survives 
upgrades and updates and such ;)
> With both drives in one big volume group, failure of one drive will
> (most likely) cause both the OS and data to be lost. 
>   
There in lies some of my confusion with this subject; correct me if I'm 
wrong in my understanding here: with LVM, I can keep adding more drives 
to a 'pool' and expand the size of the 'volume' that the OS sees 
available to it... but if any drive in that volume fails, I'd probably 
lose everything stored in that volume?!?  Sounds like a somewhat risky 
business to me, unless you *really* needed a storage volume that big 
that you had to span multiple drives to do so.

> Seperating them will mean that if your OS drive fails you can replace
> the dead drive, reinstall CentOS (or restore from a backup), and your
> data will be accessible again.
>   
Kind of what I had in mind, as the 13GB drive is much older (circa 2005, 
if its the original one put in when the previous owner built the box 
from a bare-bones kit) than the 500GB SATA drive (earlier this year, 
when I stuck it in there) so if I had to put money on one failing before 
the other... ;)
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Re: [CentOS] Centos as a file storage/backup destination (Advice)

[John R Pierce]

Roland Roland wrote:
> Hello all,
>
> am considering setting up centos as a file storage/ backup destination 
> for Mac's TimeMachine.
>
> all my users would get synced directly to specific folders on this 
> machine..
> needless to say space is of importance. where every user has an 
> average 200 GB of data to b synced (entire system)...
> I have 27 users hence 27 *200 equals to almost 6 TB so I was 
> considering getting either 4 * 1.5 TB or 6 * 1 TB to be used on one 
> PIV with a 1 GB ethernet.

I would think you should use raid for this, at least raid 5, which 
requires N+1 for N drives worth of storage.  and you probably want a 
hotspare in case a drive fails.

>  
> but the thing is, I'm an expert with this! so I'm seeking your help..
> is there any other way to do so ? is there any limitation 
> hardware/centos wise for the amount of drives available on a system?
> is Motherboard available sata/ide slots is the only limitation? how 
> about using a USB hub and plugging them as such?
>  

USB drives are quite slow, you want to use SATA for this.   you can get 
PCI-E sata expansion cards, ideally on PCI-E x4 slots which have 
sufficient bandwidth (pci-e x1 would be a bottleneck for more than a 
couple drives)

I'd  suggest getting a 'storage server' with sufficient drive bays and 
channels for what you're doing.

a server like 
http://www.asaservers.com/config.asp?config_id=ASA4002-X2Q-S2-S holds 8 
hotswap drive bays and is quite customizable.




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Re: [CentOS] mirrorlist for 5.4

[Markus Falb]

Simon Wesp wrote:

> Am Sonntag, den 08.11.2009, 15:06 + schrieb Markus Falb:
>> mirrorlist=http://mirrorlist.centos.org/?
release=5.4&arch=x86_64&repo=os
> mirrorlist=http://mirrorlist.centos.org/?release=5&arch=x86_64&repo=os
> 
> --
> Mit freundlichen Grüßen aus dem schönen Hainzell Simon Wesp
> 
> http://www.fedoraproject.org/wiki/SimonWesp Am Sonntag, den 08.11.2009,
> 15:06 + schrieb Markus Falb:
>> mirrorlist=http://mirrorlist.centos.org/?
release=5.4&arch=x86_64&repo=os
> mirrorlist=http://mirrorlist.centos.org/?release=5&arch=x86_64&repo=os
> 
> --
> Mit freundlichen Grüßen aus dem schönen Hainzell Simon Wesp
> 
> http://www.fedoraproject.org/wiki/SimonWesp Am Sonntag, den 08.11.2009,
> 15:06 + schrieb Markus Falb:
>> mirrorlist=http://mirrorlist.centos.org/?
release=5.4&arch=x86_64&repo=os
> mirrorlist=http://mirrorlist.centos.org/?release=5&arch=x86_64&repo=os

I know that release=5 is working, but this is not what i want.

In my Experience it is not always possible to upgrade all machines to the 
newest and shiniest OS out there. Not within the first week at least. So 
I have to maintain machines with 5.3 and machines with 5.4 and ...
My argument is that i do not want have Updates offered that are not 
appropriate.

("release=5.3" _is_ working)

> 
> --
> Mit freundlichen Grüßen aus dem schönen Hainzell Simon Wesp
Liebe Grüße aus dem verregnetem Wien ;-)

-- 
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[CentOS] Centos as a file storage/backup destination (Advice)

[Roland Roland]

Hello all,

am considering setting up centos as a file storage/ backup destination for 
Mac's TimeMachine.

all my users would get synced directly to specific folders on this machine..
needless to say space is of importance. where every user has an average 200 GB 
of data to b synced (entire system)...
I have 27 users hence 27 *200 equals to almost 6 TB so I was considering 
getting either 4 * 1.5 TB or 6 * 1 TB to be used on one PIV with a 1 GB 
ethernet.

but the thing is, I'm an expert with this! so I'm seeking your help..
is there any other way to do so ? is there any limitation hardware/centos wise 
for the amount of drives available on a system?
is Motherboard available sata/ide slots is the only limitation? how about using 
a USB hub and plugging them as such?

any advice is greatly appreciated 


thanks and excuse my newbie question.

best,

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Re: [CentOS] mirrorlist for 5.4

[Simon Wesp]

Am Sonntag, den 08.11.2009, 15:06 + schrieb Markus Falb: 
> mirrorlist=http://mirrorlist.centos.org/?release=5.4&arch=x86_64&repo=os
mirrorlist=http://mirrorlist.centos.org/?release=5&arch=x86_64&repo=os

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Re: [CentOS] Serious Privileges Problem: Second Post!

[mark]

Frank Cox wrote:
> On Sat, 07 Nov 2009 14:10:30 -0500
> Victor Subervi wrote:
> 
>> It's been a while, but now I remember what a dos file looks like in a unix
>> environment. No, these files look like unix files (without the carets and
>> crap).
> 
> The file command will verify that for you.
> 
> You said that this thing runs fine on another server.   Is the other server
> running Linux or Windows? (Or something else?)
> 
I've not been following this thread closely - can you run python -c script.py 
on the machine you're having trouble on?

mark

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Re: [CentOS] Serious Privileges Problem: Second Post!

[mark]

John R Pierce wrote:
> Kwan Lowe wrote:
>> On Sat, Nov 7, 2009 at 12:04 PM, Les Mikesell 
>> wrote:
>> 
>>> How did you get it from machine to machine?  This could be a line-ending
>>> issue from a copy from windows or the wrong mode in ftp.
>>> 
>> That is my guess too.   This exact error will happen if the file is copied
>> in Dos format to Linux.
> 
> ah, yes, python, where whitespace is  a syntax element

And, IIRC, spaces and tabs are two *different* elements.

mark
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Re: [CentOS] Centos HP Pavilion box

[mark]

Mike -- EMAIL IGNORED wrote:
> On Sat, 07 Nov 2009 11:33:08 -0500, mark wrote:
> 
>> Mike -- EMAIL IGNORED wrote:
>>> Has anyone put Centos 5.4 (or ant version on aHP Pavilion box? I'm
>>> having some problems.  For example, I can't get my Dell E198WFPV
>>> 1440x900 monitor to work correctly.
>> What's the video card?
>>
> Video card: NVIDA C73 [GeForce: 7100/ nForce 630i]
> 
ARGH!

Find another nvidia driver, one that supports *that* card. On the machine I use 
at work, I've got an older nVidia card (I want to say an 1100), and I found a 
driver (.173), and that supports twinview for two 
monitors. A month, month and a half ago, another admin upgraded my system, and 
I either rebooted, or something, and lost twinview, and spent an hour getting 
rid of the new driver (18?), reinstalling the old driver, and then 
reconfiguring X back to what I wanted

> When I go to: Administration -> Display -> Settings
> and select 1440x900, it changes it to 1280x1024.

Look for an *explicit* nVidia display control somewhere in your administration 
menu. The default won't do it right.

mark
-- 
"Profit-making is a technique for encouraging human enterprise, not an end in 
itself." p17, "Have I Ever Lied To You Before?", Jerry Goodis, 1972
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[CentOS] mirrorlist for 5.4

[Markus Falb]

Hi,

I tried:
mirrorlist=http://mirrorlist.centos.org/?release=5.4&arch=x86_64&repo=os
but it gives me

...snippel 
5.4 is not a valid release or hasnt been released yet/
snappel...

Why is that ?

-- 
best regards,
markus

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Re: [CentOS] Question about aspell, alpine and a Xen guest

[Pasi Kärkkäinen]

On Fri, Nov 06, 2009 at 08:39:06AM -0500, Scot P. Floess wrote:
> I have some weird behavior I can't explain...  I've noticed this behavior 
> since CentOS 5.2 (version I started running) through 5.4...
> 
> I am running a Xen host/VM.  On my guest VM, I use Alpine as my email 
> client and Aspell as the spell-check...  For whatever reason, when Aspell 
> is kicked off - there appears to be what I'd call a prolonged pause before 
> Aspell does its job.  Should I run Alpine on bare metal (even on the host 
> OS) - there is no pause whatsoever.
> 
> The pause is so bad, I've stopped using Alpine in the VM and just running 
> on the host OS itself.
> 
> Its really not a big deal, but I can't figure out what or why there is a 
> difference.  Initially I thought it might be an issue with the amount of 
> RAM I give the guest OS - I've tried from 256 MB to 768 MB - the pause is 
> the same :(
> 
> Any help or anything I can look at to figure this out - is greatly 
> appreciated!
>

What kind of pause is that? How long? 

Do you have DNS properly configured in the guest? Does network function
at full speed from the guest? 

Any errors in the logs on the guest? how about dom0?

-- Pasi

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Re: [CentOS] Virtualization option at first install CentOS-5.4 x86_64

[Mathieu Baudier]

> I've been doing a lot of research on virtualization (VMWare, EXSi, xen,
> kvm, VirtualBox, etc.) and ended up choosing kvm.  I'm very surprised at
> how quick I was able to bring up a WinXP VM.
>

# FUTURE OF KVM
David, I'm currently doing exactly the same (researching and comparing
various virtualization technologies) and I agree that it seems the way
to go in the future.

Only "problem" is that virt-manager is pretty hard to use and lacks a
lot of features which would be practical. It is better though when
using the one in Fedora, connecting to a CentOS box running
libvirtd+KVM.
What esp. lacks in the virt-manager distributed with CentOS 5.4 is the
remote management of storage pools. I guess that the upstream vendor
want to keep its proprietary Virtualization Server product
attractive... (which is in itself a guarantee that they will keep
investing in KVM, see: http://www.redhat.com/v/swf/rhev/demo.html)

# WIN XP UNDER QEMU+KVM
Regarding running Windows XP, I just wanted to share the following
with the list:
- when installing Windows XP through virt-manager, if one chooses
'Windows XP' as OS type and chooses more than 1 virtual CPU, some or
all of the physical CPUs are used to 100% and the guest is very slow
- this seems to be due to a problem where ACPI is not properly
activated: https://bugs.launchpad.net/ubuntu/+source/virt-manager/+bug/228442
- the solution is to install it as 'Windows Vista': in that case this
is indeed extremely fast, and actually I do not have the pb described
in the link above that it cannot shutdown.

I'm gathering experience around KVM and I'll probably try to
contribute it to the CentOS Wiki when it is more consolidated.
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Re: [CentOS] NTFS read and write support in CentOS 5.4 centosplus kernel?

[Lee Perez]

Xin Yang wrote:
> Hi everybody,
>
> I am a CentOS newbie, and I want to know whether the recent centosplus
> kernel supports read and write ntfs file systems or not.
>
> Regards
>
> Xin  
>
>
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>
>   
Hi Xin,

Try this link that I just googled with "NTFS read and write in CentOS 
5.4"  and found the second one down from the top:

http://wiki.centos.org/TipsAndTricks/NTFS

HTH.
Lee Perez
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Re: [CentOS] Problem: NVIDIA C73 & 1440x900

[fred smith]

On Sun, Nov 08, 2009 at 04:09:05AM +, MIKE - EMAIL IGNORED wrote:
> On Sat, 07 Nov 2009 16:42:11 -0500, fred smith wrote:
> 
> > On Sat, Nov 07, 2009 at 09:31:20PM +, MIKE - EMAIL IGNORED wrote:
> >> As mentioned in my previous thread, I can't get my Video card: NVIDIA
> >> C73 [GeForce: 7100/ nForce 630i] to display 1440x900 on my CentOS 5.4
> >> on my HP Pavilion with monitor Dell E198WFPV.
> >> 
> >> Googing around, I see that others have had this problem with the NVIDIA
> >> card.  In one case, it was solved by gaining access to card parameters
> >> and setting them directly.  I can't find a way to do this on my box.
> >> 
> >> One solution might be to just insert another video card in the bus, and
> >> ignore the NVIDIA.  Would this work?  I have a card that I know works.
> >> 
> >> Thanks in advance for your advice.
> > 
> > Mike:
> > 
> > I have no experience with that card, but here are a couple of ideas that
> > may help:
> > --are you using a digital (DVI) video cable, or the analog cable from
> >   video card to monitor? If DVI, try the analog (VGA) cable and see if
> >   it allows you to select the resolution you need. (my new DVI monitor
> >   came with a note that said that some cards cannot select the right
> >   resolution when using the DVI cable, but will work fine with a VGA
> >   cable--though it worked fine for me with my nvidia card (9800GT))
> > --have you tried using xrandr to force it to the desired resolution?
> >   'man xrandr' is your friend.
> > 
> > Fred
> 
> The screen is connected through an Iogear switch so the screen works
> with two Linux boxes.  I assume that this is a digital connection,
> although I don't really know.  Everything is fine with the other box

is it a "normal" 15-pin D-sub connector (looks like a 9-pin serial
cable, but with 15 pins instead) or is it a somewhat larger connector
with possibly several groupings of pins, including one wide/flat one?
the former is analog, the latter is digital.

> as well as the old box I am replacing.
> 
> I tried:  xrandx --verbose -s 1440x900
> 
> I get:  "Size 1440x900 is not found in available modes"
> 
> I am considering taking the video card from the old box and putting
> it in the new one, and ignoring the original card in the new box.
> Might this work?

No clue. I suppose it's worth a try.

-- 
 Fred Smith -- fre...@fcshome.stoneham.ma.us -
  "For him who is able to keep you from falling and to present you before his 
 glorious presence without fault and with great joy--to the only God our Savior
 be glory, majesty, power and authority, through Jesus Christ our Lord, before
 all ages, now and forevermore! Amen."
- Jude 1:24,25 (niv) -
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Re: [CentOS] Some basic LVM questions

[M. Hamzah Khan]

On Sat, 2009-11-07 at 22:22 -0800, Monte Milanuk wrote:
> Hello all,
> 
> I've been 'away' from all things Linux in general and RH in particular
> for a long while, so I've got some catching up to do ;)
> 
> I've got a pretty fair collection of tabs reading on LVM and how it
> works and why its such a great thing for enterprise use, etc., being
> able to add storage to the pool and all that.  LVM was just kind of
> catching on when I moved away from Linux for a while, so it's a little
> odd to me.  
> 
> What I have currently is an older PC that I'm hoping to use as a home
> server / occasional 'workstation'.  One 13GB main drive, and a 500GB
> drive for network storage.  The default install in CentOS 5.4 seems to
> want to just lump everything together in one big volume.  I was
> thinking perhaps it'd be better to have two volumes (or pools, like I
> said - still learning and not entirely confident of the lingo
> involved)... one for the main or 'system' drive (the 13GB one with /
> mounted on it), and another one for the 500GB sata drive on it - so if
> I want to add another big drive for more storage, it'd go under that
> group, ready to serve up storage to the WLAN.
> 
> Is there anything particularly 'wrong' with that layout, as compared
> to the default 'everything in one logical volume' approach that the
> installer utilized?

There won't be any issue in doing this. The installer just tries to make
things easier by creating one big volume group.

I'd say that in some ways seperating the two disks in this case would
actually be better. :)

With both drives in one big volume group, failure of one drive will
(most likely) cause both the OS and data to be lost. 

Seperating them will mean that if your OS drive fails you can replace
the dead drive, reinstall CentOS (or restore from a backup), and your
data will be accessible again.

Of course you would still have to create regular backups, or you would
still be in a very unhappy situation if the data drive fails but it
would still save you a lot of headache in the event that you encounter a
situation in which only the OS drive fails. :)

Regards

Hamzah

-- 
M. Hamzah Khan
RedHat Certified Engineer Number: 804005539516829
Email: ham...@hamzahkhan.com
URL: http://www.hamzahkhan.com
Mobile: +44 (0)7525663951


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[CentOS] NTFS read and write support in CentOS 5.4 centosplus kernel?

[Xin Yang]

Hi everybody,

I am a CentOS newbie, and I want to know whether the recent centosplus
kernel supports read and write ntfs file systems or not.

Regards

Xin  


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