[Linux-cluster] Linux-cluster Digest, Vol 71, Issue 37

Mon Mar 22 17:01:30 UTC 2010

Hi all,

A> How many partitions can be mount using cluster server RHEL 5.4 (GFS2)
B> And how many VIP can use with the same
Regards,

Rajat J Patel

FIRST THEY IGNORE YOU...
THEN THEY LAUGH AT YOU...
THEN THEY FIGHT YOU...
THEN YOU WIN...

On Mon, Mar 22, 2010 at 9:30 PM, <linux-cluster-request at redhat.com> wrote:

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> Today's Topics:
>
>   1. Re: RHCS: How to display with command line HA     resources
>      attached to service (Paul Morgan)
>   2. Re: RHCS: How to display with command line        HA      resources
>      attached to service (Moralejo, Alfredo)
>   3. Re: falure during gfs2_grow caused node crash & data loss
>      (Bob Peterson)
>   4. Re: GFS create file performance (Jeff Sturm)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 21 Mar 2010 16:39:26 -0400
> From: Paul Morgan <jumanjiman at gmail.com>
> To: linux clustering <linux-cluster at redhat.com>
> Subject: Re: [Linux-cluster] RHCS: How to display with command line HA
>        resources attached to service
> Message-ID:
>        <1b6fc7dd1003211339s4e0e901ax9fc1a539ca8af646 at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Try cman_tool services
>
> On Mar 21, 2010 11:32 AM, "Hoang, Alain" <Alain.Hoang at hp.com> wrote:
>
>  Hello,
>
> With the command, clustat ?l ?s <Service>, I could get some information,
> but
> I can not display:
>
>   - List of HA resources attached
>   - Failover Domain with its members
>
>
> Is there any other command that could give me the information?
>
> Best Regards,
> Ki?n L?m Alain Hoang,
> (???  ??? ,  ??  ?)
> Technical Consultant, Factory consulting and training
> HP Software and Solutions
> Communications & Media Solutions
> NGOSS Practice Delivery Management
>
>
>
>
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> ------------------------------
>
> Message: 2
> Date: Mon, 22 Mar 2010 10:48:38 +0100
> From: "Moralejo, Alfredo" <alfredo.moralejo at roche.com>
> To: linux clustering <linux-cluster at redhat.com>
> Subject: Re: [Linux-cluster] RHCS: How to display with command line     HA
>        resources attached to service
> Message-ID:
>        <C64734E4E1C80E49955AD539DB2FBC3A69330DBF at rkamsem703.emea.roche.com
> >
> Content-Type: text/plain; charset="utf-8"
>
> You can try rg_test command too. This is the one that provides more
> information
>
> ________________________________
> From: linux-cluster-bounces at redhat.com [mailto:
> linux-cluster-bounces at redhat.com] On Behalf Of Paul Morgan
> Sent: Sunday, March 21, 2010 9:39 PM
> To: linux clustering
> Subject: Re: [Linux-cluster] RHCS: How to display with command line HA
> resources attached to service
>
>
> Try cman_tool services
> On Mar 21, 2010 11:32 AM, "Hoang, Alain" <Alain.Hoang at hp.com<mailto:
> Alain.Hoang at hp.com>> wrote:
> Hello,
>
> With the command, clustat ?l ?s <Service>, I could get some information,
> but I can not display:
>
>  *   List of HA resources attached
>  *   Failover Domain with its members
>
> Is there any other command that could give me the information?
>
> Best Regards,
> Ki?n L?m Alain Hoang,
> (???  ??? ,  ??  ?)
> Technical Consultant, Factory consulting and training
> HP Software and Solutions
> Communications & Media Solutions
> NGOSS Practice Delivery Management
>
>
>
>
> --
> Linux-cluster mailing list
> Linux-cluster at redhat.com<mailto:Linux-cluster at redhat.com>
> https://www.redhat.com/mailman/listinfo/linux-cluster
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> ------------------------------
>
> Message: 3
> Date: Mon, 22 Mar 2010 09:52:21 -0400 (EDT)
> From: Bob Peterson <rpeterso at redhat.com>
> To: bergman at merctech.com, linux clustering <linux-cluster at redhat.com>
> Subject: Re: [Linux-cluster] falure during gfs2_grow caused node crash
>        & data loss
> Message-ID:
>        <
> 1296793451.662271269265941932.JavaMail.root at zmail06.collab.prod.int.phx2.redhat.com
> >
>
> Content-Type: text/plain; charset=utf-8
>
> ----- bergman at merctech.com wrote:
> | I just had a serious problem with gfs2_grow which caused a loss of
> | data and a
> | cluster node reboot.
> |
> | I was attempting to grow a gfs2 volume from 50GB => 145GB. The volume
> | was
> | mounted on both cluster nodes at the start of running "gfs2_grow".
> | When I
> | umounted the volume from _one_ node (not where gfs2_grow was running),
> | the
> | macine running gfs2_grow rebooted and the filesystem is damaged.
> |
> | The sequence of commands was as follows. Each command was successful
> | until the
> | "umount".
> (snip)
> | Mark
>
> Hi Mark,
>
> There's a good chance this was caused by bugzilla bug #546683 which
> is scheduled to be released in 5.5.  However, I've also seen some
> problems like this when a logical volume in LVM isn't marked as
> clustered.  Make sure it is with the "vgs" command (check if the flags
> end with a "c") and if not, do vgchange -cy <volgrp>
>
> As for fsck.gfs2, it should never segfault.  IMHO, this is a bug
> so please open a bugzilla record: Product: "Red Hat Enterprise Linux 5"
> and component "gfs2-utils".  Assign it to me.
>
> As for recovering your volume, you can try this but it's not guaranteed
> to work:
> (1) Reduce the volume to its size from before the gfs2_grow.
> (2) Mount it from one node only, if you can (it may crash).
> (3) If it lets you mount it, run gfs2_grow again.
> (4) Unmount the volume.
> (5) Mount the volume from both nodes.
>
> If that doesn't work or if the system can't properly mount the volume
> your choices are either (1) reformat the volume and restore from
> backup, (2) Use gfs2_edit to patch the i_size field of the rindex file
> to be a fairly small multiple of 96 then repeat steps 1 through 4.
>
> Regards,
>
> Bob Peterson
> Red Hat File Systems
>
>
>
> ------------------------------
>
> Message: 4
> Date: Mon, 22 Mar 2010 10:08:17 -0400
> From: Jeff Sturm <jeff.sturm at eprize.com>
> To: "linux clustering" <linux-cluster at redhat.com>
> Subject: Re: [Linux-cluster] GFS create file performance
> Message-ID:
>        <64D0546C5EBBD147B75DE133D798665F055D8C5C at hugo.eprize.local>
> Content-Type: text/plain; charset="us-ascii"
>
> > -----Original Message-----
> > From: linux-cluster-bounces at redhat.com
> [mailto:linux-cluster-bounces at redhat.com]
> > On Behalf Of C. Handel
> > Sent: Friday, March 19, 2010 5:43 PM
> > To: linux-cluster at redhat.com
> > Subject: Re: [Linux-cluster] GFS create file performance
> >
> > Is your session data valuable? what happens if you loose it? For web
> > application this normally means, that users need to login again.
>
> It varies.  Our "session" mechanism is used for a variety of purposes,
> some very short lived, others that may persist for weeks.
>
> In some cases the loss of this data will force the user to login again,
> as you say.  In other examples a link that we send in an email may
> become invalid.
>
> We may decide eventually to adopt different storage backends for
> short-lived session data, or transient vs. persistent data.
>
> > How big is your data? What is the read/write ratio?
>
> We have a 50GB GFS filesystem right now.  Reads/writes are close to 1:1.
>
> > You could go for a memcache. Try two dedicated machines with lots of
> > memory. Write your session storage to always write to both and read
> > from one. Handle failure in software. Unbeatable performance. will
> > saturate gigbit links with ease.
>
> Yup, we're aware of this and other storage alternatives.  I wanted to
> ask about it on the linux-cluster list to make sure we didn't overlook
> anything regarding GFS.  I'm also curious to know what the present
> limitations of GFS are.
>
> We actually use GFS for several purposes.  One of those is to
> synchronize web content--we used to run an elaborate system of rsync
> processes to keep all content distributed over all nodes.  We've
> replaced the use of rsync with a GFS filesystem (two master nodes, many
> spectator nodes).  This is working well.
>
> We also use GFS to distribute certain user-contributed content, such as
> images or video.  This is a read-write filesystem mounted on all cluster
> nodes.  GFS works well for this too.
>
> Our only controversial use of GFS at the moment is the session data due
> to the frequency of create/write/read/unlink that we need to support.
> Following Steven Whitehouse's great explanation last week of inode
> creation, resource groups and extended attributes, we tried disabling
> selinux on certain cluster nodes.  Surprisingly, I've seen a reduction
> of block I/O as high as 30-40% resulting from this.
>
> -Jeff
>
>
>
>
>
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> End of Linux-cluster Digest, Vol 71, Issue 37
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