Re: [CentOS] Where is timezone string stored?
On Thu, Dec 27, 2012 at 11:08 PM, Robert Moskowitz wrote: > > On 12/27/2012 03:26 PM, Reindl Harald wrote: > > Am 27.12.2012 21:17, schrieb Robert Moskowitz: > >> I am having problems with RoundCube: > >> > >> 'Your session is invalid or expired' > >> > >> So I went looking for logs and in /var/log/roundcube/errors I find LOTS > >> of warnings about problems with my timezone. Kind of a challenge to > >> copy the log entries over here (will do if needed). > >> > >> Anyway, for right now I am looking as to where my 'Detroit > >> American/New_York' (what I am seeing in Gnomes calendar preferences) > >> string is stored. > >> > >> Roundcube seems to want 'America/New_York'? > >> > >> Shouldn't I be seeing 'America/Detroit' when I look at the calendar > >> selection in Gnome? > > https://www.google.com/search?q=php+timezone > > > > php.ini: > > date.timezone = "your-timezone" > > Not the place where Centos is storing timezone. Or perhaps this is > where RoundCube is expecting it? This file is at its default content. > It is timestamped Jul 3. > > And /etc/localtime is a binary file. A little digging and it SEEMS that > files are copied to /etc/localtime from /usr/share/zonetime ? > > But I can't figure out what RoundCube is doing. Probably will have to > go and join that list... > > > > > _______ > CentOS mailing list > CentOS@centos.org > http://lists.centos.org/mailman/listinfo/centos > The timezone in PHP should be configured according to your needs manually. RoundCube is looking at /etc/php.ini , if you have installed php from yum on centos -- Best Regards, Yonatan Pingle RHCT | RHCSA | CCNA1 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] awk awk
On Fri, Dec 7, 2012 at 2:23 AM, Steve Brooks wrote: > > > Why are you doing all that piping and grepping? And the -F" " confuses > > me...oh, I see. First, whitespace is the default field separator in awk. > > Then, are you asking if there's a line with a "." in it, or just any > > non-whitespace? If the latter... mmm, I see, you *really* don't > understand > > awk. > > > Ok Mark very nice of you to help Craig. He does not claim to be an expert > in "awk" or even competent ---> Which is obviously why he is asking for > help in the first place. No need for the sarcasm and to belittle the > poster. Remember lots of people looking for help will be directed to this > answer and your help could be much appreciated > > Regards, > > Steve > ___ > CentOS mailing list > CentOS@centos.org > http://lists.centos.org/mailman/listinfo/centos > Hello there! The best Help for awk beginners is to implement it with other tools for now if it's urgent, and debug your syntax and regex code. Start here: http://www.unix.com/man-page/linux/1/sed/ You may also want to try and print awk to tty, start by that to debug your code until you find the solution http://www.staff.science.uu.nl/~oostr102/docs/nawk/nawk_92.html your main issue was, that you are asking about nginx.conf , which is not part of the stock installation, and your file can look like anything depending on custom configuration. -- Best Regards, Yonatan Pingle RHCT | RHCSA | CCNA1 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] URGENT -- pseudo network interface creating problem with dhcp-- centos 5.5
Have you checked if your motherboard IPMI is not pulling an address during boot? On Wed, Apr 11, 2012 at 3:28 PM, Markus Falb wrote: > On 11.4.2012 12:35, sri wrote: > ... >> My linux box, running with Centos-5.5, is showing up (??) a pseudo >> network interface for Eth0. >> On Switch where my Eth0 is connected, observed 2 MAC-Addresses. >> If a DHCP server present in LAN, the second pseudo interface is >> picking up a DHCP IP Address too. >> Furthermore you can ping both Eth0 ip and Psedo Eth0 IP from the switch. >> The intensity of the problem is more when port-security is configured >> on SW for that port. >> >> “ifconfig –a” is not showing that pseudo interface. > > Show us the output of ifconfig -a > -- > Kind Regards, Markus Falb > > > ___ > CentOS mailing list > CentOS@centos.org > http://lists.centos.org/mailman/listinfo/centos > -- Best Regards, Yonatan Pingle RHCT | RHCSA | CCNA1 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] lots of small files in a folder on Linux centos
On Sun, Jul 24, 2011 at 5:13 PM, R P Herrold wrote:
> On Sun, 24 Jul 2011, yonatan pingle wrote:
>
>> the coder is not tech savvy as one might expect, so it's
>> really hard for me to explain the issue of having lots of
>> files in one folder to the site owner or to the coder.
>
> I do not expect coders to remain 'not tech savvy'
>
> If the coder is not willing to learn and to test, you are
> already doomed, and should walk away from the project
>
> To show the problem, take a pile of pennies, and ask the coder
> to find one with a given year. The coder will have to do a
> linear search, to even know if the target exists. Then show a
> egg carton with another pile of pennies sorted and labelled by
> year in each section, and aask them to repeat the task -- in
> the latter case, it is a 'single seek' to solve the problem
>
> Obviously, the target year may not even be present. With a
> single pile (directory) the linear search is still required,
> but with 'binning' by years, that is obvious by inspection as
> well
>
>
> One approach to lots of files in a single directory (which can
> cause problems in getting timely access to a specific file) is
> to build a permuted directory tree from the file names to
> spread the load around. If the files are of a form where they
> have 'closely identical' names [pix1.jpg, pix2.jpg,
> etc], first build a 'hashed' version of the file name with
> md5sum, or such, to level the hash leading characters
>
> [herrold@localhost ~]$ ./hashdemo.sh
> pix1.jpg fd8f49c6487588989cd764eb493251ec
> pix2.jpg 12955d9587d99becf3b2ede46305624c
> pix3.jpg bfdc8f593676e4f1e878bb6959f14ce2
> [herrold@localhost ~]$ cat hashdemo.sh
> #!/bin/sh
> #
> CANDIDATES="pix1.jpg pix2.jpg pix3.jpg"
> for i in `echo "${CANDIDATES}"`; do
> HASH=`echo "$i" | md5sum - | awk {'print $1'}`
> echo "$i ${HASH}"
> done
> [herrold@localhost ~]$
>
> then, we look to the leading letter of the hask, to design our
> egg carton bins. We place pix1.jpg in directory: ./f/ and
> pix2.jpg in directory ./1/ and pix3.jpg in directory
> ./b/ and so forth -- if the directories get too full again,
> you might go to using the first two letters of the hash to
> perform the 'binning' process
>
> The md5sum function is readily available in php, as are
> directory creation and so forth, so positioning the files, and
> computing the indexes are straightforward there
>
> This is all pretty basic stuff, covered in Knuth in TAOCP long
> ago
>
> -- Russ herrold
> ___
> CentOS mailing list
> CentOS@centos.org
> http://lists.centos.org/mailman/listinfo/centos
>
Thank you for the excellent analogy , i will actually use it to
explain the matter.
I do hope he understands the simple logic behind a proper directory
tree, it's clearly a design flaw, bad planning or laziness which lead
him to this state.
unfortunately, as bash is easier to read then English for you and me,
ill spare the demohash.sh code from him , and simply put it out in
words , and hope he figures out the proper way to create a tree.
I am strongly tempted to walk away on this one, normally when there no
co-operation and statements like "it's a problem with the server "
when clearly it's a code issue , it's just nerve wrecking to try and
help these guys.
as i said earlier , he was hosted directly on a virtual server with
the largest isp in my country , and they have failed to help him (
just selling him more ram and cpu, until it got to a breaking point ).
I have actually co-locate at the very same ISP and i know for a fact
they are awesome when it comes to support...
--
Best Regards,
Yonatan Pingle
RHCT | RHCSA | CCNA1
___
CentOS mailing list
CentOS@centos.org
http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] lots of small files in a folder on Linux centos
On Sun, Jul 24, 2011 at 4:02 PM, John R. Dennison wrote: > On Sun, Jul 24, 2011 at 03:53:46PM +0300, yonatan pingle wrote: >> >> Yes Ryan, that exactly what i have done. >> he will get the log shortly and i will get some not free beer. > > While I'm all for mysql optimization it's clearly evident from an > earlier posting that your disks are thrashing with insanely high iowait > figures; and while it's _possible_ for this to be caused by mysql you > really have to go out of your way to achieve that type of behavior. > > > > > > John > -- > The best argument against democracy is a five minute conversation > with the average voter. > > -- Winston Churchill > > ___ > CentOS mailing list > CentOS@centos.org > http://lists.centos.org/mailman/listinfo/centos > > this is exactly what i was thinking, that's an insane iowait value, taking into consideration its a VM , not the hardware machine , and the fact the he fills up all his ram along with slow queries showing in the log, it's simply bad code and wrong handling of files. -- Best Regards, Yonatan Pingle RHCT | RHCSA | CCNA1 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] lots of small files in a folder on Linux centos
On Sun, Jul 24, 2011 at 3:43 PM, Ryan Wagoner wrote: > On Sun, Jul 24, 2011 at 8:40 AM, yonatan pingle > wrote: >> im good with mysqltuner.pl, >> as it seems there are slow queries on mysql and i have adjusted all >> values in my.cnf according to the application needs. >> >> looks like it's all in the code and the way the CMS handles the files >> from that upload directory , so there is nothing wrong with the centos >> machine after all, it's doing it's job >> >> ill point the coder to the status page and hope he gets a clue. >> >> thank you everybody for the good advices, i am now sure it's not "my fault" >> :-) >> >> /thread >> >> -- >> Best Regards, >> Yonatan Pingle >> RHCT | RHCSA | CCNA1 > > Sounds like you need to enable logging in mySQL for slow queries. Give > your developer the log and let him know to either optimize the queries > or create indexes appropriately to improve the performance. > > Ryan > ___ > CentOS mailing list > CentOS@centos.org > http://lists.centos.org/mailman/listinfo/centos > Yes Ryan, that exactly what i have done. he will get the log shortly and i will get some not free beer. :-) -- Best Regards, Yonatan Pingle RHCT | RHCSA | CCNA1 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] lots of small files in a folder on Linux centos
>> RHCT | RHCSA | CCNA1 > > If you are using phpMyAdmin the status page will aid you in tuning > mySQL. Look for values in red. The description will usually tell you > what to adjust to improve performance. > > Ryan > ___ > CentOS mailing list > CentOS@centos.org > http://lists.centos.org/mailman/listinfo/centos > im good with mysqltuner.pl, as it seems there are slow queries on mysql and i have adjusted all values in my.cnf according to the application needs. looks like it's all in the code and the way the CMS handles the files from that upload directory , so there is nothing wrong with the centos machine after all, it's doing it's job ill point the coder to the status page and hope he gets a clue. thank you everybody for the good advices, i am now sure it's not "my fault" :-) /thread -- Best Regards, Yonatan Pingle RHCT | RHCSA | CCNA1 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] lots of small files in a folder on Linux centos
>> >> > > Do you have cahcing turned on in CMS? That could help. > > -- > > Ljubomir Ljubojevic > (Love is in the Air) > PL Computers > Serbia, Europe > > Google is the Mother, Google is the Father, and traceroute is your > trusty Spiderman... > StarOS, Mikrotik and CentOS/RHEL/Linux consultant > ___ > CentOS mailing list > CentOS@centos.org > http://lists.centos.org/mailman/listinfo/centos > there is no caching system, its a " home made" CMS. -- Best Regards, Yonatan Pingle RHCT | RHCSA | CCNA1 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] lots of small files in a folder on Linux centos
On Sun, Jul 24, 2011 at 2:19 PM, Alexander Dalloz wrote: > Am 24.07.2011 13:03, schrieb Eero Volotinen: >> 2011/7/24 yonatan pingle : > >>> uploads]# ls | wc -l >>> 3123 > >> I assume that you are using ext3 or ext4 filesystems? Both ext3 and >> ext4 slows down, if there is too much files in same directory. >> XFS-fs is solution to fix this problem. > >> Eero > > Seriously, 3123 files in a single directory is not an issue for any of > the extX filesystems. Though ext2 probably performs the worst, ext3 and > particular ext4 should not have any problem with that small amount of > file objects. Given that the filesystem is not already filled nearby 100%. > > An issue may be, how the code deals with the directory content. Horrible > code for sure can impact the speed of the website, but should not affect > the system globally. > > Yonatan, if you really are concerned about the uploads directory, then > use vmstat, iostat or sar to check system parameters while the directory > is accessed. > > Your problem is something else, I am pretty sure. > > Alexander > > ___ > CentOS mailing list > CentOS@centos.org > http://lists.centos.org/mailman/listinfo/centos > Hi, Alexander good suggestions, ill monitor I/O and mysql code, sounds like a code related issue and not a centos issue after all. it runs on ext3 ,i could only guess how to code deals with the dir, as it seems to be the site builds the pages using php+mysql for each visitor, with about 40K unique visitors a day, that is a lot of I/O. This looks like an issue with MySQL after all. Queries: 48.0M qps: 66 Slow:65.0 avg-cpu: %user %nice %system %iowait %steal %idle 0.970.000.28 97.910.000.84 runq-sz plist-sz ldavg-1 ldavg-5 ldavg-15 0 102 5.30 3.13 2.06 2 120 3.14 2.77 2.22 we wait and see, tail -f log-slow-queries.log /usr/sbin/mysqld, Version: 5.0.67-community-log (MySQL Community Edition (GPL)). started with: Tcp port: 3306 Unix socket: /var/lib/mysql/mysql.sock Time Id CommandArgument thank you -- Best Regards, Yonatan Pingle RHCT | RHCSA | CCNA1 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] lots of small files in a folder on Linux centos
Hello, I have a rather annoying issue on going with one of my centos virtual servers. the server hosts a website using apache and mysql ,there are three persons involved with keeping the site up and running. and i am his root due to the fact he does not know anything with about Linux. there is an php/sql coder , and the site owner which only knows to use the CMS and upload new articles to the website. the coder and the site owner work together for a long time already , i am their new admin ( as the last one was a major ISP which failed to host the site properly ). lately the server is under-preforming and load averages are high, mysql service keeps crashing and the server is hitting max memory usage ( so i added ram .. ) , after looking into the website folders, i have found one folder which from my point of view is one of the causes for the server loads. (sorry for piping ls ). uploads]# ls | wc -l 3123 I have talked with the site owner, which in turn showed this to the coder ,now he throws the ball back claiming: it has nothing to do with server performance. the folder is full of images, about 40K each, and i have good reason to believe this is the problem, as this is not the first time i see that a folder which includes a large amount of files causes a server to under-perform. the coder is not tech savvy as one might expect, so it's really hard for me to explain the issue of having lots of files in one folder to the site owner or to the coder. the hardware is a decent machine dual E5530 24RAM with six hard drives in raid. the virtual server has 2GB of ram and it's own CPU share ( 4 cores 8 threads ). the coder is arguing with facts sadly to say he has the site owner on "his side". long story short, how should i explain in the most simple way in plain english that having that much files in a folder will cause a server to work slower? pros vs cons of having a large amount of small files in the same folder on Linux Centos? -- Best Regards, Yonatan Pingle RHCT | RHCSA | CCNA1 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] problems with burning i386 centos 6 dvd
On Fri, Jul 15, 2011 at 7:54 PM, Keith Roberts wrote: > On Thu, 14 Jul 2011, John R Pierce wrote: > >> To: centos@centos.org >> From: John R Pierce >> Subject: Re: [CentOS] problems with burning i386 centos 6 dvd >> >> On 07/14/11 4:14 AM, Keith Roberts wrote: >>> I've also looked into the differences between DVD-R(W) >>> disks, and the DVD+R(W) disks. It appears that the DVD+R(W) >>> disks are more reliable, as they have better error >>> correction methods that their DVD-R(W) counterparts. >> >> My experience is, some players/readers prefer the DVD-R, others prefer >> the DVD+R, but most anything newer than first generation ancient DVD >> doesn't care. DVD-R has slightly more capacity which is important >> here. I think the differennce in reliability is a red herring. > > Hi John. This is the article I was eluding to in my post: > > Article Why DVD+R(W) is superior to DVD-R(W) > Date June 2003 > Author Michael Spath > > http://www.myce.com/article/Why-DVDRW-is-superior-to-DVD-RW-203/ > > As you can see, it's dated June 2003, so it might not be so > relevant now? > > Kind Regards, > > Keith Roberts > > - > Websites: > http://www.karsites.net > http://www.php-debuggers.net > http://www.raised-from-the-dead.org.uk > > All email addresses are challenge-response protected with > TMDA [http://tmda.net] > - > ___ > CentOS mailing list > CentOS@centos.org > http://lists.centos.org/mailman/listinfo/centos > Any pros vs cons on using a bootable USB thumb drive instead of CD/DVD ? this might be the better solution as the images just grow larger and larger each update. I find it much faster to install from USB. -- Best Regards, Yonatan Pingle RHCT | RHCSA | CCNA1 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Problem with AT&T VPN
I am not sure it's related to centos that much, when it comes to port forwarding, if you might use iptables correctly with several NIC(s), if you can create a vlan with your linksys, like they talk about here: http://www.dd-wrt.com/phpBB2/viewtopic.php?p=4692 I would configure a DMZ pool for the laptop usage only, and forward the needed ports correctly towards the end user Network port. this might help you also for your centos iptables configuration : http://www.howtoforge.com/nat_iptables On Wed, Jul 13, 2011 at 11:41 PM, wrote: > Timothy Murphy wrote: >> >> I'm running a CentOS-5.6 server, >> which in general runs perfectly. >> My setting is possibly a little unusual: >> ADSL -> Billion 5200S RC modem/router -> CentOS-5.6 HP MicroServer >> -> Linksys WRT54GL router . >> >> My daughter is just visiting me, >> and she has to contact her job using AT&T VPN >> on her laptop under Windows XP. >> >> Unfortunately this does not work on my system >> when connected to the Linksys router by WiFi or ethernet. >> More precisely, the IBM Lotus "sametime" application does not work, >> and she cannot access the IBM Intranet homepage >> which she needs to use company tools and applications. > > You may have a port closed that, um, damn, it's only been 3 years since I > was using that client, and I can't remember the name, anyway, that it > uses. > > mark > > > _______ > CentOS mailing list > CentOS@centos.org > http://lists.centos.org/mailman/listinfo/centos > -- Best Regards, Yonatan Pingle RHCT | RHCSA | CCNA1 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Is it safe to run tune2fs -c -1 -i 0 /dev/sda2 on mounted file system
On Thu, Jul 7, 2011 at 11:10 PM, Simon Matter wrote: >> Hi, >> >> Is it safe to run tune2fs -c -1 -i 0 /dev/sda2 on mounted file system >> >> Basically, this is a command to disable fsck based on reboot count & >> last fsck time. > > The RHEL/CentOS installed does exactly this, -c 0 -i 0, so yes it's > considered safe. > > Simon > > ___ > CentOS mailing list > CentOS@centos.org > http://lists.centos.org/mailman/listinfo/centos > Hi, It would be much better controlling this values from your /etc/fstab file, so in case of any future references to fsck on boot, you will know what's configured by file. man fstab , and read about the sixth field. -- Best Regards, Yonatan Pingle RHCT | RHCSA | CCNA1 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Bash rotating tab completion with list
Hello Dotan, you might want to ask your sysadmin about this, it's a package that can be compiled from source. last time a checked ( a long time back ), they use both redhat 7.3 and solaris as the core system in the univ ( in tel-aviv at least ). you can check the system version & type with a simple cat /etc/issue , or cat /etc/*relea* if it's a centos based system, the admin would have to install the package manually , or install the epel repo and use yum the proper way. most of the end users don't even use the terminal, so this is not a common question, and i am sure the root admin will be glad to help you with this. On Mon, Jun 13, 2011 at 7:28 PM, Dotan Cohen wrote: > On Mon, Jun 13, 2011 at 17:24, yonatan pingle > wrote: >> Hi Dotan, >> >> have you already installed this: >> >> http://download.fedora.redhat.com/pub/epel/5/x86_64/repoview/bash-completion.html >> > > Nice, thanks. I was certain that I'm not the first to want this. > > Is there any way to configure this without the bash-completion > package, for instance for use on the university students' server? > (which I'm not even sure is RH based, it's something old and probably > home-grown) > > -- > Dotan Cohen > > http://gibberish.co.il > http://what-is-what.com > ___ > CentOS mailing list > CentOS@centos.org > http://lists.centos.org/mailman/listinfo/centos > -- Best Regards, Yonatan Pingle RHCT | RHCSA | CCNA1 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Bash rotating tab completion with list
Hi Dotan, have you already installed this: http://download.fedora.redhat.com/pub/epel/5/x86_64/repoview/bash-completion.html On Mon, Jun 13, 2011 at 3:21 PM, Dotan Cohen wrote: > I just got off a Windows 7 terminal which has rotating tab completion, > this means that in the case of completion ambiguity the shell > completes one of the possibilities, and subsequent tabs complete to > different possibilities. This in contrast to bash's behaviour of > simply printing a list of possibilities. > > Googling I have found that bash can in fact have rotating completion > by setting "\C-i": menu-complete. However, I would really like the > first tab to show the possibilities (default behaviour, albeit on the > second tab), and subsequent tabs to rotate. I can't figure this out. > Any ideas? > > Thanks! > > -- > Dotan Cohen > > http://gibberish.co.il > http://what-is-what.com > ___ > CentOS mailing list > CentOS@centos.org > http://lists.centos.org/mailman/listinfo/centos > -- Best Regards, Yonatan Pingle RHCT | RHCSA | CCNA1 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] SSD for Centos SWAP /tmp & /var/ partition
On Sun, May 22, 2011 at 2:06 PM, Keith Roberts wrote: > On Sun, 22 May 2011, yonatan pingle wrote: > >> To: CentOS mailing list >> From: yonatan pingle >> Subject: Re: [CentOS] SSD for Centos SWAP /tmp & /var/ partition >> >> On Sun, May 22, 2011 at 10:57 AM, Steven Crothers >> wrote: >>>> >>>> I was running on 3gbps sata bus, and the performance was great, it >>>> just dies in one big crash without giving any clues about it. >>> >>> If only SSD's were a viable solution for long-term storage, we could >>> theoretically increase our virtualization many times over. It's to bad >>> the technology hasn't come far enough to be used that way though >>> without costing an arm and leg. > > But it's going in the right direction now. > >>> -- >>> Steven Crothers >>> steven.croth...@gmail.com > > >> the only way to go with SSD is RAID due to these reasons. >> it's unlikely that two disks will die at the same time, so it's >> possible to use and enjoy them , >> but don't forget to have a fresh backup and a raid array. ( that >> should be done also with an ordinary disk array anyways ). > > That's EXACTLY what I was thinking. Two 40GB SSD drives in a RAID array > would not cost much at all. Move all the disk intensive stuff to that. I > only have two root partitions of 20GB each for my main install - everything > else is on other partitions on 2 x 500GB E-IDE drives. So putting the root > partion on a small SSD (possibly RAIDed) is another option. Like most new > electronics components, as time passes the mass production cost fall > dramatically, and the technology improves. Look at the way HDD technology > continues to advance. > > Maybe in 5 years time the cost of SSD's will be alot cheaper? Possibly in > another 15 years time HDD's with moving parts will be consigned to history > and science museums? I'm watching this technology very closely, and I'm very > tempted to buy a small 40GB SSD like OWC's. > > They keep performing at optimal speed according to the specs for that drive. > > The OWC SSD's are supposed to have a MTTF of 2 million hours, PLUS they do > not degrade over time. So if an OWC keeps going until MTTF, that's 24 x 365 > = 8760 HPY. 200 / 8760 = 228.31 years MTTF ? > > So why does it only have a 3 year warranty? - LOL > > For me anything on SWAP has to be better than a s/h drive thats had almost a > years running time according to the SMART data on the drive: > > 9 Power_On_Hours 0x0032 090 090 000 > Old_age Always - 7913 > > 329 days running time already - let's see how long this one lasts before it > kicks the bucket. > > Kind Regards, > > Keith Roberts > > - > Websites: > http://www.karsites.net > http://www.php-debuggers.net > http://www.raised-from-the-dead.org.uk > > All email addresses are challenge-response protected with > TMDA [http://tmda.net] > - > ___ > CentOS mailing list > CentOS@centos.org > http://lists.centos.org/mailman/listinfo/centos > > I hardly swap to disk these days , and after the bad experience with ssd as swap only ... i would stick to RAM & sata. RAM is so cheap , just get extra ram , and use PAE if 32bit (?) adjust vm.swappiness ( sysctl ) to a lower value then 60 ( default ) , and you will be fine swapping on sata drives if and when needed. if you are afraid of memory fragmentation , don't be .. in most cases you will be rebooting the server when a new kernel update will come out as it is the main question is , which kind of applications are you planning to run on your machine, and what is your actual hardware *needs*, that only you can tell. also, for /tmp , you might like the idea of a ramdisk ( or tmpfs ) , it is a great way to speed up things without breaking the piggy bank. this is what i use in /etc/fstab for my home desktop as /tmp : /tmpfs /tmp tmpfs size=512M,nr_inodes=5k,noatime,nodiratime,noexec 0 0 does the job well. anyways - if it's for home usage Don't think twice get an SSD . -- Best Regards, Yonatan Pingle RHCT | RHCSA | CCNA1 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] SSD for Centos SWAP /tmp & /var/ partition
On Sun, May 22, 2011 at 10:57 AM, Steven Crothers wrote: >> I was running on 3gbps sata bus, and the performance was great, it >> just dies in one big crash without giving any clues about it. > > If only SSD's were a viable solution for long-term storage, we could > theoretically increase our virtualization many times over. It's to bad > the technology hasn't come far enough to be used that way though > without costing an arm and leg. > > -- > Steven Crothers > steven.croth...@gmail.com > ___ > CentOS mailing list > CentOS@centos.org > http://lists.centos.org/mailman/listinfo/centos > the only way to go with SSD is RAID due to these reasons. it's unlikely that two disks will die at the same time, so it's possible to use and enjoy them , but don't forget to have a fresh backup and a raid array. ( that should be done also with an ordinary disk array anyways ). -- Best Regards, Yonatan Pingle RHCT | RHCSA | CCNA1 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] SSD for Centos SWAP /tmp & /var/ partition
On Sun, May 22, 2011 at 2:40 AM, Steven Crothers wrote: > On Sat, May 21, 2011 at 6:29 PM, yonatan pingle > wrote: >> if you use the SSD for swap, don't put anything important on them, I >> have managed to destroy a drive which was used for heavy swap >> operations. >> (insane experiment with KVM virtual machines got to that situation ). >> the machines used the drive as RAM. ( that was an intel drive! ). > > I have to ask, how was your performance before death? I don't have a > sacrificial SSD laying around so I can't exactly test myself. I > imagine the gains had to be pretty high? > > Were you running a 3 or 6 gbps sata bus? > > -- > Steven Crothers > steven.croth...@gmail.com I was running on 3gbps sata bus, and the performance was great, it just dies in one big crash without giving any clues about it. -- Best Regards, Yonatan Pingle RHCT | RHCSA | CCNA1 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] SSD for Centos SWAP /tmp & /var/ partition
Hi Keith not sure about OCZ reliability for production , but i can confirm Intel x-25 drives work great with centos ( about 11 month's now ). I use two drives as /var in md mirror , using it for SQL and logs - it's an amazing boost vs ordinary drives. if you use the SSD for swap, don't put anything important on them, I have managed to destroy a drive which was used for heavy swap operations. (insane experiment with KVM virtual machines got to that situation ). the machines used the drive as RAM. ( that was an intel drive! ). I did experience a bad OCZ drive in the past, that's the reason i gone for the intel disks instead for production. the OCZ one died from normal usage on a laptop as a single drive. the intels might be slower then other SSD drives, but i find them to be very reliable in contrast for normal (sane) usage. On Sat, May 21, 2011 at 9:56 AM, Keith Roberts wrote: > On Sat, 21 May 2011, Eero Volotinen wrote: > >> To: CentOS mailing list >> From: Eero Volotinen >> Subject: Re: [CentOS] SSD for Centos SWAP /tmp & /var/ partition >> >> 2011/5/20 Keith Roberts : >>> Has anyone actually used a SSD in a Centos setup? >> >> Yes. >> >> >>> I'm wondering if it would be a good idea to use a new SSD >>> for moving all the disk i/o to, that Linux likes to do so >>> often. Plus putting SWAP onto a decent SSD should speed >>> things up somewhat. >> >> Just buy fastest ocz drive than you can find from stores. >> > > Regards, > > Keith > -- Best Regards, Yonatan Pingle RHCT | RHCSA | CCNA1 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Detecting harddrive problem
On Fri, Feb 25, 2011 at 4:11 AM, Fajar Priyanto wrote: > Hi all, > Recently I realize the filesystem became Read-only and there is "media > error" message in the system log. It has passed several days without > notice. > I'm thinking of setting up a script to grep that "media error" and send email. > Is there more elegant way of doing this? > > Thank you. > ___ > CentOS mailing list > CentOS@centos.org > http://lists.centos.org/mailman/listinfo/centos > Actions needed to be done: Buy new disk Remove old disk Install OS on new disk Migrate data from old disk done. elegant way? but two new disks. configure mdadm to mail you if the array fails. -- Best Regards, Yonatan Pingle RHCT | RHCSA | CCNA1 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Problem with timezone configuration
On Mon, Feb 21, 2011 at 1:41 AM, John Nash wrote: > > Hello, > > I have a problem configuring the timezone on a CentOS 5.5 server. > I would like the timezone to be Europe/Paris. > > I have followed the steps described here: > http://www.wikihow.com/Change-the-Timezone-in-Linux > > I think I have changed the appropriate configuration files ( /etc/localtime, > /etc/sysconfig/clock ), but the output of the ‘date’ command still indicates > the timezone is EST. > > > [root@xxx ~]# cat /etc/redhat-release > CentOS release 5.5 (Final) > [root@s15370074 ~]# ls -l /etc/localtime > lrwxrwxrwx 1 root root 32 Feb 19 18:31 /etc/localtime -> > /usr/share/zoneinfo/Europe/Paris > [root@xxx ~]# cat /etc/sysconfig/clock > ZONE="Europe/Paris" > UTC=true > ARC=false > [root@xxx ~]# echo $TZ > > [root@xxx ~]# > [root@xxx ~]# date > Sun Feb 20 18:01:28 EST 2011 > [root@xxx ~]# rdate -s time.mit.edu > [root@xxx ~]# hwclock –systohc > [root@xxx ~]# date > Sun Feb 20 18:03:34 EST 2011 > > > Note that I have even completely rebooted the server, with no effect. > > Am I missing something important ? > > Thank you in advance for your suggestions ! > > > ___ > CentOS mailing list > CentOS@centos.org > http://lists.centos.org/mailman/listinfo/centos > > why work hard? yum install system-config-date system-config-date -- Best Regards, Yonatan Pingle RHCT | RHCSA | CCNA1 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] [SOLVED] Re: LVM problem after adding new (md) PV
On Thu, Feb 24, 2011 at 3:31 PM, Tomasz Nowak wrote: > I solved this issue thanks to help on linux-lvm list from a guy from redhat. > Initrd image had to be recreated so that new raid devices could be seen > before root is mounted. Solution: > # mkinitrd /boot/initrd-$(uname -r).img $(uname -r) > > -- > Tomasz > > ___ > CentOS mailing list > CentOS@centos.org > http://lists.centos.org/mailman/listinfo/centos > thank you for the update. this might help new users. -- Best Regards, Yonatan Pingle RHCT | RHCSA | CCNA1 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Alternative to cPanel
On Wed, Feb 23, 2011 at 4:49 PM, Trutwin, Joshua wrote: > Hello all, > > > > I'm looking to setup a new CentOS box for a buddy of mine who > wants to do hosting on a server via CoLo, Years ago I whipped up a CP of my > own on a Debian box he colo’d running a basterdized qmail/tinydns and custom > built httpd/mysql/etc (I was young). It worked ok but time to move on and I > don't have time to maintain all those packages. I also don't have > time to write another CP or port my PoS to it. I’m also just going to use > the > > default packages (bind, postfix, etc) instead of the DJB stuff. > > Main requirements are fairly straightforward: > > 1. able to add/manage domains, ssl cert management, manage DNS records > 2. able to manage email accounts and anti-spam settings > 3. able to add/manage mysql and pgsql (nice to have) > 4. user management - ftp/ssh accounts, password change, etc. > 5. nice to have: add a wordpress blog / xcart store to a site > 6. nice to have: users have own login to do some of the above for their > domain only > 7. nice to have: integrated website stats (awstats or equiv) > 8. not optional - should have a focus on security > > Stuff like viewing logs, automated billing, hosting plans, managing backups, > bandwidth monitoring, uploading web pages, managing server patches, > adding new software, etc. I don't mind leaving off or doing myself. Willing > to > > pay a license, but not a huge budget. > > I was leaning towards webmin/virtualmin but thought I'd check with this list > for any suggestions. Had bad experiences with Plesk from a while > ago so leaving that off the table. We have experience with cPanel > through another fail host, it's ok but too much stuff and too > expensive. > > Josh > > ___ > CentOS mailing list > CentOS@centos.org > http://lists.centos.org/mailman/listinfo/centos > > Hey there, some are run with ispconfig some with cPanel , some use DirectAdmin control panel , DirectAdmin which proven itself to be a reliable hosting panel "layman friendly" , would be my suggestion. if you are talking about hosting your own stuff, it won't be needed ,but when it comes to providing third party access to the account, cPanel or DirectAdmin are the best choice. -- Best Regards, Yonatan Pingle RHCT | RHCSA | CCNA1 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] how to optimize CentOS XEN dom0?
you should have a look at your I/O disk status. try with iostat -dx 5 to see the disk utilization info over time. when it comes to slowdown on a virtual environment on a Desktop grade machine, i suspect disk I/O latency and bottleneck as a cause. check that your disk is running at its optimal state. look at some indicators , such the the I/O utilization averages, server load averages hddtemp /dev/sda will check for heating ( under high load it might ) in any case , you still got plenty of ram to spend. On Wed, Feb 23, 2011 at 1:46 AM, Rudi Ahlers wrote: > On Wed, Feb 23, 2011 at 1:41 AM, Ian Murray wrote: >> Are they paravirt of HVM guests? qemu might have something to do with it if >> HVM >> guests are involved. >> > > > Uhm, I know that I should know this, but how do I tell from a quick > glance? It's almost 2am in the morning here, and I'm a bit too tired > to think straight right now. I've been reading up on a lot of forums > and other google search results before I posted here. > > The VM's were originally created with HyperVM, but then imported into > CloudMin. > > > > -- > Kind Regards > Rudi Ahlers > SoftDux > > Website: http://www.SoftDux.com > Technical Blog: http://Blog.SoftDux.com > Office: 087 805 9573 > Cell: 082 554 7532 > ___ > CentOS mailing list > CentOS@centos.org > http://lists.centos.org/mailman/listinfo/centos > -- Best Regards, Yonatan Pingle RHCT | RHCSA | CCNA1 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Software RAID Level 1, smartd and changing dev numbers
partprobe as root should refresh the kernel partition / disk cache instead of a reboot. On Wed, Feb 16, 2011 at 7:30 PM, Robert Heller wrote: > At Wed, 16 Feb 2011 12:00:27 -0500 (EST) CentOS mailing list > wrote: > >> >> We have about 50 CentOS servers with software RAID level 1 (mirroring). >> Each week, we swap out one of the drives (the one in the second of four >> hot-swap bays, only the first two of which contain drives) on each server >> and take them offsite for safekeeping. >> >> The problem is, the kernel seemingly randomly switches between /dev/sdb >> and /dev/sdc for these devices. This makes the process slower by >> requiring more manual input where a script(s) could otherwise suffice. > > I'm assuming these are actually SATA disks with a controller that > supports hot-swap. > > What I think is happening is that the kernel retains some 'memory' of > the pulled drive (say /dev/sdb) and when the fresh drive is installed, a > new dev file is created (/dev/sdc). Eventually, /dev/sdb is forgotten > by the time the next 'swap' and /dev/sdb is assigned to the next fresh > disk. > > Question: are you always swapping in a *new* disk each week or > re-inserting the disk from the previous week? > >> >> It also confuses smartd, which AFAIK, needs the correct device names to >> report accurately. >> >> Ideally, we'd like to force the OS at some level to always see these >> devices as /dev/sda and /dev/sdb. If not, is there at least some way to >> configure smartd to be "smart" and recognize which devices are in use? > > The cure might be that you need to do a reboot to properly rescan the > disks. > >> >> TIA, >> ___ >> CentOS mailing list >> CentOS@centos.org >> http://lists.centos.org/mailman/listinfo/centos >> >> > > -- > Robert Heller -- 978-544-6933 / hel...@deepsoft.com > Deepwoods Software -- http://www.deepsoft.com/ > () ascii ribbon campaign -- against html e-mail > /\ www.asciiribbon.org -- against proprietary attachments > > > > ___ > CentOS mailing list > CentOS@centos.org > http://lists.centos.org/mailman/listinfo/centos > -- Best Regards, Yonatan Pingle RHCT | RHCSA | CCNA1 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] rescheduling sector linux raid ?
take a closer look at the message it states: end_request: I/O error, dev sda, sector 451792263 this usually indicates there is corruption on the disk. the meaning is quite simple, you have a problem with your first disk /dev/sda , and you need to investigate it further. first of all run a smartctl --all /dev/sda look for FAIL messages, this will help indicate the cause of the I/O error. second step - to be sure its a bad disk ( sometimes it's not actually the disk ). check the cable connecting the disk , and replace it with a fresh one if available. also, i would recommend to check the power cable/supply this might cause I/O errors also. On Mon, Feb 14, 2011 at 8:39 PM, Robert Heller wrote: > At Mon, 14 Feb 2011 20:13:31 +0200 CentOS mailing list > wrote: > >> >> Hi List, >> >> What this means? >> >> md: syncing RAID array md0 >> md: minimum _guaranteed_ reconstruction speed: 1000 KB/sec/disc. >> md: using maximum available idle IO bandwidth (but not more than >> 20 KB/sec) for reconstruction. >> md: using 128k window, over a total of 2096384 blocks. >> md: md0: sync done. >> RAID1 conf printout: >> --- wd:2 rd:2 >> disk 0, wo:0, o:1, dev:sda2 >> disk 1, wo:0, o:1, dev:sdb2 >> sd 0:0:0:0: SCSI error: return code = 0x0600 >> end_request: I/O error, dev sda, sector 451792231 >> raid1: sda1: rescheduling sector 451792168 >> sd 0:0:0:0: SCSI error: return code = 0x0600 >> end_request: I/O error, dev sda, sector 451792263 >> raid1: sda1: rescheduling sector 451792200 >> raid1: sdb1: redirecting sector 451792168 to another mirror >> raid1: sdb1: redirecting sector 451792200 to another mirror >> md: syncing RAID array md0 >> md: minimum _guaranteed_ reconstruction speed: 1000 KB/sec/disc. >> md: using maximum available idle IO bandwidth (but not more than >> 20 KB/sec) for reconstruction. >> md: using 128k window, over a total of 2096384 blocks. >> md: md0: sync done. >> RAID1 conf printout: >> --- wd:2 rd:2 >> disk 0, wo:0, o:1, dev:sda2 >> disk 1, wo:0, o:1, dev:sdb2 >> >> note lines: >> >> sd 0:0:0:0: SCSI error: return code = 0x0600 >> end_request: I/O error, dev sda, sector 451792263 >> raid1: sda1: rescheduling sector 451792200 >> raid1: sdb1: redirecting sector 451792168 to another mirror >> raid1: sdb1: redirecting sector 451792200 to another mirror >> >> Is one disk going down? cat /proc/mdstat still shows software raid >> array as working one. > > One disk is probably starting to fail. Are you getting SMART errors? > Have a look in /var/log/messages for smartd messages as well as kernel > I/O errors. > > -- > Robert Heller -- 978-544-6933 / hel...@deepsoft.com > Deepwoods Software -- http://www.deepsoft.com/ > () ascii ribbon campaign -- against html e-mail > /\ www.asciiribbon.org -- against proprietary attachments > > > > ___ > CentOS mailing list > CentOS@centos.org > http://lists.centos.org/mailman/listinfo/centos > -- Best Regards, Yonatan Pingle RHCT | RHCSA | CCNA1 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Centos 5.5 + firefox 3.6 and 64bit javaplugin (1.6u23)
Hey there! the newer plugin should work with latest Firefox , just configure the path correctly and you are set ,or use a symlink. check out this fine article http://koolinus.wordpress.com/2009/10/29/enable-java-plugin-on-firefox-with-centos-or-rhel-64bit/ what is your uname -a ? , maybe you have a repo that has it. On Thu, Feb 10, 2011 at 11:06 PM, Keith Roberts wrote: > On Thu, 10 Feb 2011, Eero Volotinen wrote: > >> To: CentOS mailing list >> From: Eero Volotinen >> Subject: Re: [CentOS] Centos 5.5 + firefox 3.6 and 64bit javaplugin (1.6u23) > > snip > >> Looks like firefox is 32bit version, not 64bit version, but 32bit java >> 1.6.u23 still fails. >> >> about:plugins just says no plugins are installed. any clues? > > Yep ;) > > I had the same problem. It appears the name of the java > plugin has now changed. Also it lives in an obscure place. > > In a nutshell - You need a symlink from your mozilla > plugins directory to the JAVA plugin file, which is now > called libnpjp2.so > > [ajb@stxsl /usr/lib/mozilla/plugins]$ > > OLD JAVA PLUGIN: > > lrwxrwxrwx 1 root root 54 May 24 15:36 > libjavaplugin_oji.so -> > /usr/java/default/plugin/i386/ns7/libjavaplugin_oji.so > > > NEW JAVA PLUGIN: > lrwxrwxrwx 1 root root 38 May 24 15:57 libnpjp2.so -> > /usr/java/default/lib/i386/libnpjp2.so > > > Please see this forum link for all the gory details: > https://www.centos.org/modules/newbb/viewtopic.php?topic_id=27062&forum=38&post_id=111090#forumpost111090 > > > Kind Regards, > > Keith Roberts > > - > Websites: > http://www.karsites.net > http://www.php-debuggers.net > http://www.raised-from-the-dead.org.uk > > All email addresses are challenge-response protected with > TMDA [http://tmda.net] > --------- > ___ > CentOS mailing list > CentOS@centos.org > http://lists.centos.org/mailman/listinfo/centos > -- Best Regards, Yonatan Pingle RHCT | RHCSA | CCNA ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
