Ming,
I have never seen HA-LVM properly described either.
Here is a little bit:
http://www.nxnt.org/2010/09/redhat-cluster-howto/
The notion of tags is crucial to understanding how HA-LVM works. It worked
pretty well the last time I used it about 2 years ago, but I did not do a lot
of testin
I am curious why the designers of RHEV V3.0 did not use GFS2 for their shared
storage. It seems that this would be a natural choice. Instead RHEV 3.0
allows either NFS or raw shared LUNs, I believe.
Anybody has some thoughts on this subject?
Thanks and regards,
Chris Jankowski
--
Linux-clus
*Unidirectional* replication is probably a better phrase to describe what EMC
SRDF and all other typical block mode storage arrays do for replication.
Typically this is used for manual or semi-automated DR systems and works very
well for this purpose. This approach splits the HA and DR domains.
Yu,
GFS2 or any other filesystems being replicated are not aware at all of the
block replication taking place in the storage layer. This is entirely
transparent to the OS and filesystems clustered or not. Replication happens
entirely in the array/SAN layer and the servers are not involved at
sk
vote=3 ,node votes=3, total=6) which is not recommened I guess (?).
Steve
On Wed, Jul 6, 2011 at 11:46 AM, Jankowski, Chris
mailto:chris.jankow...@hp.com>> wrote:
Paras,
A curiosity question:
How do you make sure that your storage will survive failure of *either* of your
site without
Paras,
A curiosity question:
How do you make sure that your storage will survive failure of *either* of your
site without loss of data and continuity of service?
What storage configuration are you using?
Thanks and regards,
Chris
From: linux-cluster-boun...@redhat.com
[mailto:linux-cluster-b
There is a school of thought among practitioners of Business Continuity that
says:
HA != DR
The two cover different domains and mixing the two concepts leads to horror
stories.
Essentially, HA covers a single (small or large) component failure. If
components can be duplicated and work
Digimer,
I think you published an earlier version before.
Isn't it the time to introduce versioning, release dates and also list of
deltas from version to version?
Mundane things, I know. But if you want to make this a useful document for
others they are all very necessary, I think.
Regards,
Sufyan,
What username does the instance of Oracle DB run as? Is this "orainfra" or some
other username?
The scripts assume a user named "orainfra".
If you use a different username then you need to modify the scripts accordingly.
Regards,
Chris Jankowski
-Original Message-
From: linux
and DR in multi-site environment. There are specialized forums for this.
Regards,
Chris
-Original Message-
From: urgrue [mailto:urg...@bulbous.org]
Sent: Sunday, 1 May 2011 02:42
To: linux clustering
Cc: Jankowski, Chris
Subject: Re: [Linux-cluster] How do you HA your storage?
I do
I am just wondering, why would you like to do it this way?
If you have SAN then by implication you have a storage array on the SAN. This
storage array will normally have capability to give you highly available
storage through RAID{1,5,6}. Moreover, any decent array will also provide
redundanc
Konrad,
The first thing to do is to recompile your application using a parallelizing
compiler with proper parameter equal to the number of cores on your server.
This of course assumes that you have the source code for your application.
For a properly written Fortran and C application a modern
uster, but, I used gfs. If I use and
active-passive conf, I believe that I shouldn't use gfs. Anyone could explain
me how to configure a cluster without gfs?.
Thanks.!
2011/4/19 Jankowski, Chris
mailto:chris.jankow...@hp.com>>
Marcelo,
The paper you mentioned is now 6 years old.
Marcelo,
The paper you mentioned is now 6 years old. Quite a bit has changed in RHEL
CS and Oracle DB since.
If you need RAC and you are doing this for a living, I recommend that you
invest in these two books:
For Oracle 11g (published in 2010):
http://www.amazon.com/Pro-Oracle-Database-11g-
>-Original Message-
>From: linux-cluster-boun...@redhat.com
>[mailto:linux-cluster-boun...@redhat.com] On Behalf Of Jeff Sturm
>Sent: Tuesday, 25 January 2011 09:02
>To: linux clustering
>Subject: Re: [Linux-cluster] gfs2 v. zfs?
>> -Original Message-
>> From: linux-cluster-boun..
outputs "Shutdown
complete, exiting" and completes its own shutdown.
-
As a workaround, I set status_poll_interval="10" for the time being, although I
believe that I should be forced to rely on short polling interval.
Regards,
Chris Jankowski
-Original Mess
...@redhat.com
[mailto:linux-cluster-boun...@redhat.com] On Behalf Of Lon Hohberger
Sent: Thursday, 9 December 2010 06:49
To: linux clustering
Subject: Re: [Linux-cluster] How do I implement an unmount only filesystem
resource agent
On Mon, 2010-12-06 at 12:27 +, Jankowski, Chris wrote:
>
> T
clustering
Subject: Re: [Linux-cluster] rgmanager gets stuck on shutdown, if no services
are running on its node.
On Wed, 2010-12-08 at 03:11 +, Jankowski, Chris wrote:
> Hi,
>
> I configured a cluster of 2 RHEL6 nodes.
> The cluster has only one HA service defined.
>
> I h
n Behalf Of Lon Hohberger
Sent: Thursday, 9 December 2010 07:33
To: linux clustering
Subject: Re: [Linux-cluster] Heuristics for quorum disk used as a tiebreaker in
a two node cluster.
On Fri, 2010-12-03 at 10:10 +0000, Jankowski, Chris wrote:
> This is exactly what I would like to achieve. I know w
on shutdown, if no services
are running on its node.
Hi,
On 12/08/2010 04:11 AM, Jankowski, Chris wrote:
> Hi,
>
> I configured a cluster of 2 RHEL6 nodes.
> The cluster has only one HA service defined.
>
> I have a problem with rgmanager getting stuck on shutdown whe
Hi,
I configured a cluster of 2 RHEL6 nodes.
The cluster has only one HA service defined.
I have a problem with rgmanager getting stuck on shutdown when certain set of
conditions are met. The details follow.
1.
If I execute "shutdown -h now" on the node that is *not* running the HA service
th
Hi,
I am configuring a service that uses HA-LVM and XFS filesystem on top of it.
The filesystem will be backed up by a separate script run from cron(8) creating
an LVM snapshot of the filesystem and mounting it on a mountpoint.
To have a foolproof HA service I need to:
- Check, if the sna
Hi,
What is the difference between -d and -s options of clusvcadm? When would I
prefer using one over the other?
The manual page for clusvcadm(8) says:
-d Stops and disables the user service named
-s Stops the service named until a member
transition or until it is enabled a
Hi,
I am configuring a two node HA cluster that has only one service.
The sole purpose of the cluster is to keep the service up with minimum
disruption for the widest possible range of failure scenarios.
I configured a quorum disk to make sure that after a failure of a node, the
cluster (now co
really appreciate it.
Regards,
Chris Jankowski
-Original Message-
From: Fabio M. Di Nitto [mailto:fdini...@redhat.com]
Sent: Friday, 3 December 2010 19:27
To: linux clustering
Cc: Jankowski, Chris
Subject: Re: [Linux-cluster] Validation failure of cluster.conf.
On 12/3/2010 6:33 AM
Hi,
I am in a process of building a cluster on RHEL6.
I elected to build the /etc/cluster/cluster.conf (attached) by hand i.e. no
Conga.
After I added fencing and fence devices the configuration file no longer passes
validation check.
ccs_config_validate reports the following error:
[r...@boob
Yvette,
You can:
- either use GFS2 with concurrent access to your filesystem from both nodes, as
this is a cluster filesystem
- or use ext3/XFS as a failover filesystem - mounted by no more than one of the
cluster nodes at any time.
Either of the two approaches will have HA characteristics with
action safe.
On Wed, 2010-11-24 at 14:27 +, Jonathan Barber wrote:
> On 24 November 2010 09:48, Xavier Montagutelli
> wrote:
> > On Wednesday 24 November 2010 09:34:48 Jankowski, Chris wrote:
> >> Xavier,
> >>
> >> Thank you for the
nux clustering
Subject: Re: [Linux-cluster] RHEL 6 cluster filesystem resource and LVM
snapshots
On Wednesday 24 November 2010 01:20:42 Jankowski, Chris wrote:
> Hi,
>
> 1.
> I found in the "Logical Volume Manager Administration" manual for RHEL 6 on
> p.12 and on p.35 the fo
pport LVM snapshots?
Thanks and regards,
Chris Jankowski
-----Original Message-
From: Jankowski, Chris
Sent: Wednesday, 24 November 2010 07:23
To: 'linux clustering'
Subject: RE: [Linux-cluster] RHEL 6 cluster filesystem resource and LVM
snapshots
Roger,
Thank you.
I
...@redhat.com] On Behalf Of Roger Pena Escobio
Sent: Wednesday, 24 November 2010 01:32
To: linux clustering
Subject: Re: [Linux-cluster] RHEL 6 cluster filesystem resource and LVM
snapshots
--- On Tue, 11/23/10, Jankowski, Chris wrote:
> From: Jankowski, Chris
> Subject: Re: [Linux-cluster]
: [Linux-cluster] RHEL 6 cluster filesystem resource and LVM
snapshots
On Tuesday 23 November 2010 07:13:56 Jankowski, Chris wrote:
> Hi,
>
> I am preparing a build of a RHEL 6 cluster with a filesystem resource(s)
> (ext4 or XFS). The customer would like to use LVM snap
Hi,
I am preparing a build of a RHEL 6 cluster with a filesystem resource(s) (ext4
or XFS). The customer would like to use LVM snapshots of the filesystems for
tape backup. The tape backup may take a few hours after which the snapshot
will be deleted.
Questions:
1.
Is the filesystem resourc
Hi,
RHEL 6 now officially supports XFS, as an additional subscription option, I
believe.
Does the RHEL 6 Linux Cluster provide the necessary module to configure an XFS
filesystem as a failover service?
Thanks and regards,
Chris Jankowski
--
Linux-cluster mailing list
Linux-cluster@redhat.com
Regards,
Chris Jankowski
-Original Message-
From: Digimer [mailto:li...@alteeve.com]
Sent: Friday, 12 November 2010 14:44
To: Jankowski, Chris
Cc: linux clustering
Subject: Re: [Linux-cluster] Starter Cluster / GFS
On 10-11-11 10:25 PM, Jankowski, Chris wrote:
> Digimer,
>
>
need minimum of 3 Ethernet interfaces per server and minimum of 6 if
all links will be bonded, but this is OK.
Regards,
Chris Jankowski
-Original Message-
From: Digimer [mailto:li...@alteeve.com]
Sent: Friday, 12 November 2010 13:42
To: Jankowski, Chris
Cc: linux clustering
Subject: Re: [
luding login to the service processor is less than 1 ms. Delay
or lack thereof is not a problem. The transactional nature of the processing
is the issue.
Regards,
Chris Jankowski
-Original Message-
From: Digimer [mailto:li...@alteeve.com]
Sent: Friday, 12 November 2010 03:39
To: linux
Of Digimer
Sent: Friday, 12 November 2010 03:44
To: linux clustering
Subject: Re: [Linux-cluster] Starter Cluster / GFS
On 10-11-11 04:23 AM, Gordan Bobic wrote:
> Jankowski, Chris wrote:
>> Digimer,
>>
>> 1.
>> Digimer wrote:
>>>>> Both partitions will
: Thursday, 11 November 2010 21:08
To: linux clustering
Subject: Re: [Linux-cluster] Starter Cluster / GFS
Jankowski, Chris wrote:
> Gordan,
>
> I do understand the mechanism. I was trying to gently point out that
> this behaviour is unacceptable for my commercial IP customers. The
>
: Re: [Linux-cluster] Starter Cluster / GFS
Digimer wrote:
> On 10-11-10 10:29 PM, Jankowski, Chris wrote:
>> Digimer,
>>
>> 1.
>> Digimer wrote:
>>>>> Both partitions will try to fence the other, but the slower will lose and
>>>>> get fenc
make sense in real world. I
cannot think of one.
Regards,
Chris Jankowski
-Original Message-
From: Digimer [mailto:li...@alteeve.com]
Sent: Thursday, 11 November 2010 15:30
To: linux clustering
Cc: Jankowski, Chris
Subject: Re: [Linux-cluster] Starter Cluster / GFS
On 10-11-10 10:29 PM,
Digimer,
1.
Digimer wrote:
>>>Both partitions will try to fence the other, but the slower will lose and
>>>get fenced before it can fence.
Well, this is certainly not my experience in dealing with modern rack mounted
or blade servers where you use iLO (on HP) or DRAC (on Dell).
What actually h
Jakov,
If you make it general enough you may end up with rsync.
How would you position your tool in the continuum between ccs_tool update ..
And rsync?
Where would it add value?
Regards,
Chris Jankowski
-Original Message-
From: linux-cluster-boun...@redhat.com
[mailto:linux-cluster
Robert,
One reason is that with GFS2 you do not have to do fsck on the surviving node
after one node in the cluster failed.
Doing fsck ona 20 TB filesystem with heaps of files may take well over an hour.
So, if you built your cluster for HA you'd rather avoid it.
The locks need to be recovere
Corey,
I vaguely remember from my work on UNIX clusters many years ago that if /dir is
the mount point of a mounted filesystem then cd /dir or into any directory
below /dir from an interactive shell will prevent an unmount of the filesystem
i.e. umount /dir will fail. I believe that this restr
Hi,
I read the beta 2 release notes for RHEL 6. It mentions numerous changes in
the cluster for RHEL 6, but nothing about GFS2.
Are there any GFS2 changes in RHEL 6 compared with RHEL 5.x?
Thanks and regards,
Chris Jankowski
--
Linux-cluster mailing list
Linux-cluster@redhat.com
https://www.
Why did you have to set iLO as non-shared?
Thank and regards,
Chris
From: linux-cluster-boun...@redhat.com
[mailto:linux-cluster-boun...@redhat.com] On Behalf Of ESGLinux
Sent: Wednesday, 8 September 2010 22:57
To: linux clustering
Subject: Re: [Linux-cluster] n
Ben,
Thank you for pointing me at fence_scsi.
It looks like fence_scsi will fit the bill elegantly. And it should be much
more reliable then iLO fencing if the cluster uses properly configured, dual
fabric FC SAN for shared storage.
I read the fence_scsi manual page and have one more question.
Hi,
How can I reconcile the need to have Kdump configured and operational on
cluster nodes with the need for fencing of a node most commonly and
conveniently implemented through iLO on HP servers?
Customers require Kdump configured and operational to be able to have kernel
crashes analysed by
ki
-Original Message-
From: linux-cluster-boun...@redhat.com
[mailto:linux-cluster-boun...@redhat.com] On Behalf Of Gordan Bobic
Sent: Friday, 18 June 2010 18:38
To: linux clustering
Subject: Re: [Linux-cluster] qdisk WITHOUT fencing
On 06/18/2010 07:57 AM, Jankowski, Chris wrote:
>
s constraint is normally
impossible, though some scripting logic could allow to bypass completely the
fencing and guarantee the integrity of the cluster.
Brem
On Thu, 2010-06-17 at 23:31 +0000, Jankowski, Chris wrote:
> Jim,
>
> You hit architectural limitation of Linux Cluster, wh
Jim,
You hit architectural limitation of Linux Cluster, which is specific to Linux
Cluster design, which other clusters tend not to have.
Linux Cluster assumes that you will *always* be able to execute fencing of
*all* other nodes. In fact, this is a stated *prerequisite* for correct
operatio
e, I would be happy to listen to any additional suggestions to
further improve performance.
Thanks!
Jankowski, Chris wrote:
> Michael,
>
> I do not know the process for setting this up in a multipathing
configuration, but the scheduler to test is the noop scheduler.
>
> Please let us
he moment, the scheduler files for each blockdevice contain this line:
"noop anticipatory deadline [cfq]"
Maybe I would have to do something like
"echo [noop] anticipatory deadline cfq > /sys/block/sd*/queue/scheduler"
instead?
Thanks for the help.
Jankowski, Chr
rlying storage. This is extremely surprising and a bit
shocking I must say.
I guess for the Reads I will need to check the SAN itself, see if I can do any
optimization on it.. That thing can't possibly be that bad when it comes to
reading..
Thanks a lot for your ideas so far!
Jankowski, Chr
Michael,
For comparison, could you do your dd(1) tests with a very large block size (1
MB) and tell us the results, please?
I have a vague hunch that the problem may have something to do with coalescing
or not of IO operations.
Also, which IO scheduler are you using?
Thanks abnd regards,
Chr
to-increase-gfs2-performance-in-a-cluster.html
Regards,
Celso.
____
From: "Jankowski, Chris"
To: linux clustering
Sent: Fri, April 16, 2010 9:39:54 PM
Subject: Re: [Linux-cluster] Two node cluster, start CMAN fence the other node
Alex,
1.
Thank you ver
thing to add... I'm going to play a little with the quorum devices.
Hope it helps!
Alex
On 04/16/2010 05:00 PM, Jankowski, Chris wrote:
eparate the cluster interconne
--
Linux-cluster mailing list
Linux-cluster@redhat.com
https://www.redhat.com/mailman/listinfo/linux-cluster
Alex,
What exactly did you configure for IGMP?
Did you also separate the cluster interconnect traffic in its own VLAN?
Thanks and regards,
Chris
From: linux-cluster-boun...@redhat.com
[mailto:linux-cluster-boun...@redhat.com] On Behalf Of Alex Re
Sent: Friday,
ESG,
Yes, there is a BIOS entry that you need to modify - "Boot on power on" or some
such. I do not remember from the top of my head where it is in the RBSU menu
structure, but you can certainly configure it to reboot after fence through
iLO. I did that a few months ago for a customer on DL380
, 8 April 2010 01:18
To: Jankowski, Chris
Cc: linux clustering
Subject: Re: [Linux-cluster] Listing openAIS parameters on RHEL Cluster Suite 5
On 07/04/10 04:33, Jankowski, Chris wrote:
> Chrissie,
>
> Thank you for the explanation.
>
> With the expected_nodes, I have the para
Another comment:
You can certainly do it, but you may be surprised that the result may not be
neither as resilient generally nor as highly available as initially hoped, due
to the limitations of the cluster subsystems.
I'll give just two examples where you may hit unresolvable difficulties -
Hi,
On a heavily used cluster with GFS2 is it worth setting up jumbo Ethernet
frames on the cluster interconnect link? Obviously, if only miniscule portion
of the packets travelling through this link are larger than standard 1500 MTU
then why to bother.
I am seeing significant traffic on the
Hi,
As per Red Hat Knowledgebase note 18886 on RHEL 5.4 I should be able to get the
current in-memory values of the openAIS paramemters by running the following
commands:
# openais-confdb-display
totem.version = '2'
totem.secauth = '1'
# openais-confdb-display totem token
totem.token = '1'
Hi,
1.
>>>yeah, my first inkling was to symlink /etc/cron.daily but that breaks so
>>>much existing functionality.
I was actually thinking about /var/spool/cron/crontabs directory. You can put
your cron definitions there in the old UNIX style. It works perfectly well and
is more general and f
A few ideas.
1.
What about replacing the directory containing the cron job descriptions in /var
with a symbolic link to a directory on the sahred filesystem.
2.
You application service start/stop script may modify the cron job description
files. This is more complex, as it has to deal with rem
: linux clustering
Subject: Re: [Linux-cluster] GFS2 - monitoring the rate of Posix lock operations
Hi,
On Mon, 2010-03-29 at 12:15 +, Jankowski, Chris wrote:
> Steven,
>
> >>>You can use localflocks on each node provided you never access any of the
> >>>locked fil
boun...@redhat.com
[mailto:linux-cluster-boun...@redhat.com] On Behalf Of Steven Whitehouse
Sent: Monday, 29 March 2010 19:41
To: linux clustering
Subject: Re: [Linux-cluster] GFS2 - monitoring the rate of Posix lock operations
On Sun, 2010-03-28 at 02:32 +, Jankowski, Chris wrote:
> Steve,
&
Thanks and regards,
Chris
-Original Message-
From: linux-cluster-boun...@redhat.com
[mailto:linux-cluster-boun...@redhat.com] On Behalf Of Steven Whitehouse
Sent: Saturday, 27 March 2010 00:26
To: linux clustering
Subject: Re: [Linux-cluster] GFS2 - monitoring the rate of Posix lock operat
-cluster-boun...@redhat.com
[mailto:linux-cluster-boun...@redhat.com] On Behalf Of Steven Whitehouse
Sent: Saturday, 27 March 2010 00:21
To: linux clustering
Subject: Re: [Linux-cluster] dump(8) for GFS2
Hi,
On Fri, 2010-03-26 at 02:48 +, Jankowski, Chris wrote:
> Hi,
>
>
Hi,
Question:
-
Are there any plans to develop a backup utility working on the same principles
as dump(8) does for ext3fs? This means getting the backup done by walking the
block structure contained in the inodes instead of just reading the file the
way tar(1), cpio(1) and others do it.
Hi,
I understand that GFS2 by default has a limit on the rate of POSIX locks to 100
per second.
This limit can be removed by the following entry in /etc/cluster/cluster.conf:
Question 1:
How can I monitor the rate of POSIX lock operations?
The reason I am asking this question is
Hi,
The man page that I have for fence_scsi(8) lists (among others) the following
restrictions in use:
- The fence_scsi fencing agent requires a minimum of three nodes in the cluster
to operate.
- In addition, fence_scsi cannot be used in conjunction with qdisk.
I am puzzled by those restrict
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