[DRBD-user] Problems using image files with drbd, maybe unsupported?

Martin Fandel pingu.freak at gmx.de
Wed Oct 6 14:09:44 CEST 2010


Thats exactly the point of my question :). How can I make the system stable for unplanned failovers? Power loss for example? In this case, HA has no chance for cleaning up the resources. :/

-------- Original-Nachricht --------
> Datum: Wed, 6 Oct 2010 11:30:19 +0200
> Von: Bart Coninckx <bart.coninckx at telenet.be>
> An: "Martin Fandel" <pingu.freak at gmx.de>
> CC: drbd-user at lists.linbit.com
> Betreff: Re: [DRBD-user] Problems using image files with drbd,	maybe unsupported?

> On Wednesday 06 October 2010 10:51:54 Martin Fandel wrote:
> > Hi,
> > 
> > hearbeat does the same as I do in the following steps:
> > 
> > drbd disconnect all
> > drbd primary all
> > mount /dev/drbd0 /var/lib/xen/images
> > 
> > However, in a heartbeat environment, the xen images are also damaged. If
> > the primary node fails, all xen images located in /var/lib/xen/images
> are
> > inconsistent and not bootable.
> > 
> > I can avoid this by using fsck on the images. But I don't know how use
> fsck
> > on image files. Does anybody know this?
> > 
> > Thanks!
> > 
> > Regards,
> > 
> > Martin
> > 
> > -------- Original-Nachricht --------
> > 
> > > Datum: Tue, 5 Oct 2010 21:59:06 +0200
> > > Von: Bart Coninckx <bart.coninckx at telenet.be>
> > > An: drbd-user at lists.linbit.com
> > > CC: "Martin Fandel" <pingu.freak at gmx.de>
> > > Betreff: Re: [DRBD-user] Problems using image files with drbd, maybe
> > > unsupported?
> > > 
> > > On Tuesday 05 October 2010 12:26:08 Martin Fandel wrote:
> > > > Hi,
> > > > 
> > > > I'm not sure if I understand the documentation correct. I've
> installed
> > > > SLES10 with DRBD and Xen. I added an drbd-device /dev/drbd0 for the
> xen
> > > > image files. The drbd device /dev/drbd0 is created with ext3 and is
> > > > mounted to /var/lib/xen/images. Under this directory, 10 vms are
> > > > installed. If I do an switch to the backup machine, xen can't start
> the
> > > > image files / the guest. The kernel says:
> > > > 
> > > > [87585.519596] EXT3-fs: INFO: recovery required on readonly
> filesystem.
> > > > [87585.519602] EXT3-fs: write access unavailable, cannot proceed.
> > > > 
> > > > Is it possible, that image files with drbd are not supported? I've
> also
> > > > found an tutorial on google. In the tutorial is a notice, that the
> > > > image files must be dumped to dedicated drbd partitions?
> > > > 
> > > > Thanks!
> > > > 
> > > > Regards,
> > > > 
> > > > Martin
> > > 
> > > You need to install the heartbeat rpms for SLES10 and configure DRBD
> > > resources
> > > so the DRBD resource becomes active after failover.
> > > 
> > > B.
> 
> I probably should have mentionned that a resource for a ext3 volume should
> also be made, so that with planned failovers you get a clean result.
> However, 
> this is not the best thing to happen for running Xen guests, because they
> will 
> sense their storage has just been swept from under their feet. So you also
> need to add Xen resources. Personally with SLES 10 I would run guests on
> iSCSI 
> storage hosted by DRBD and Heartbeat.
> 
> B.
> 
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