Re: [Xen-users] Re: drbd non-live migration with drbd

[Aleksandar Ivanisevic <aleksandar@xxxxxxxxxxxxx>]

On 01/26/2010 12:28 PM, Fajar A. Nugraha wrote:
> On Tue, Jan 26, 2010 at 4:50 PM, Aleksandar Ivanisevic
> <aleksandar@xxxxxxxxxxxxx>  wrote:
> > > For PV's this is possible using drbd OCF ra drbd instead of phy in Xen
> > > config, but has some catches related to outdating drbd.
> > Which catches? Where is this documented? I thought all you have to do
> > is use drbd block scripts and xen will take care of everything.
> Have you tried this? I'm using drbd (tried 8.2 and 8.3) with Xen
> 3.4.1, drbd block script simply doesn't work. I finally settled with
> using drbd 8.3 and phy:/dev/drbd/by-res/
it works, sort of, it is all pretty fishy

if you are using pygrub drbd resource heeds to be named the same as the 
device (resource drbd0 for /dev/drbd0, etc..) or you can patch blkif.py 
as in this bug (comment #2)
http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1438

it will work as long as you put drbd resource as primary at the 
beginning, migration and all (so far, did only a few hops)
If you don't use pygrub and specify kernel, root, etc in the config file 
then the block driver brings up the resource, but it locks up after 
migration

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