DRBD MC - unstable cluster with latest corosync and pacemaker

To: drbd-user [at] lists
From: Lars Ellenberg <lars.ellenberg [at] linbit>
Sent by: drbd-user-bounces [at] lists
Date: 07/24/2010 07:52AM
Subject: Re: [DRBD-user] DRBD MC - unstable cluster with latest corosync and pacemaker

On Sat, Jul 24, 2010 at 02:09:47PM +0200, Rasto Levrinc wrote:
>
> On Fri, July 23, 2010 10:44 pm, Jamie L Sammons wrote:
> > Environment:
> >
> >
> > CentOS 5.5
> > DRBD 8.3.8
> > Corosync 1.2.5
> > Pacemaker 1.0.9
> >
> >
> > Whenever I use DRBD MC to manage the configuration above, I run into
> > stability problems with the cluster. Here is some of the behavior I have
> > observed:
> >
> >
> > 1. Corosync crash across cluster members. When I try to restart corosync
> > I receive a Bus Error and cannot restart it until I reboot the system.
> > 2. Frequent disconnects and reconnects across the cluster members.
> > 3. Unresponsive cluster. Whenver I try to manage the cluster in DRBD MC
> > commands are ignored.
>
> Yes, the problem is that 'corosync -v' leaks shared memory in Corosync
> 1.2.5 and it happens that DRBD MC runs this command regularly to find out
> the version. Reboot clears the shared memory.
>
> For now you can remove this line from drbd-gui-helper:
> ($cs_version) = `$cs_prog -v` =~ /'(\d+\.\d+\.\d+)'/;
>
> and run DMC with --keep-helper option, or use different Corosync version.

I'd recommend to use heartbeat as the cluster communication layer.

--
: Lars Ellenberg
: LINBIT | Your Way to High Availability
: DRBD/HA support and consulting http://www.linbit.com"]http://www.linbit.com

DRBD® and LINBIT® are registered trademarks of LINBIT, Austria.
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To: drbd-user [at] lists
From: "Rasto Levrinc" <rasto.levrinc [at] linbit>
Sent by: drbd-user-bounces [at] lists
Date: 07/24/2010 06:26PM
Subject: Re: [DRBD-user] DRBD MC - unstable cluster with latest corosync and pacemaker

On Sat, July 24, 2010 4:57 pm, Jamie L Sammons wrote:

> It also appears that Corosync 1.2.6 is out which may also address the
> issue:
>
>
> * Fix problem where flight recorder leaks files in shared memory
> filesystem. Also clean up the error handling of the shared memory
> allocation code of the flight recorder.

Yeah, I saw that, but I wasn't sure if flight recorder is needed to print
out the version. Now I know. :) Anyway it's been confirmed that it's been
fixed in 1.2.6.

I've just released DRBD MC 0.7.7, so that it works with this Corosync
version.

Thanks for helping,

Rasto

--
: Dipl-Ing Rastislav Levrinc
: DRBD-MC http://www.drbd.org/mc/management-console/"]http://www.drbd.org/mc/management-console/
: DRBD/HA support and consulting http://www.linbit.com/"]http://www.linbit.com/
DRBD(R) and LINBIT(R) are registered trademarks of LINBIT, Austria.


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