[DRBD-user] Layering drbd8 and LVM2 to minimize split-brain

Rene Mayrhofer rene.mayrhofer at gibraltar.at
Mon Oct 15 00:12:32 CEST 2007

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

On Sonntag 14 Oktober 2007, Kelly Byrd wrote:
> > c) Using drbd8 volumes as the Xen backend devices, on top of LVM2. That
> > is,
> > both cluster nodes hold one (or two, the second one for swap) LV(s) for
> > each
> > Xen domU and those are synced with one drbd8 primary/secondary volume
> > each.
> I do this with VMware Server:
> - Big storage (raid0, raid5, raid10, whatever) as /dev/md0
> - One volume group, many logical volumes.
> - One drbd resource (pri/sec) per logical volume, make a filesystem on
> this.
> - One VM per drbd.
> With this, I avoid pri/pri, but I can still migrate VMs one at a time
> from node to node.

And this construction is stable for you? How many drbd resources do you have 
running? On which hardware, with which kernel, if you don't mind me asking?

I am currently running Debian etch on HP servers (with 3/4 GB RAM and raid1 
storage backends for the volume groups - one at each node), but it's far from 
stable, and all crashes/hangs/reboots in the last few months were caused by 
drbd in one form or the other.

best regards,

Gibraltar firewall       http://www.gibraltar.at/
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