Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On Fri, Jul 25, 2008 at 11:49:33AM +0200, Heiko wrote:
> On Fri, Jul 25, 2008 at 11:07 AM, Robert Verspuy <robert at exa-omicron.nl> wrote:
> > Michael schreef:
> >>
> >> Why not to use loop?
> >> assing xen image to loop1 ( drbd1 (
> >> loop2 to drbd2 ... etc...
> >>
> Hello,
>
> do you mean that I create a Xen Image, than do a "losetup /dev/loop1
> /VM/my.image"
> and than configure that loop1 as a disk:
>
> on server1 {
> device /dev/drbd0;
> disk /dev/loop1
> address 192.168.2.1:7788;
> meta-disk internal;
> }
do not do this.
drbd on top of loop _will_ deadlock sooner or later.
you have been warned.
> or can I just do:
>
> on server1 {
> device /dev/drbd0;
> disk /VM/my.image
> address 192.168.2.1:7788;
> meta-disk internal;
> }
>
>
> >
> > But then (I think), you can't do a live migration ??
> > because there's no software making sure that writes to the image from both
> > server do not write to the same block at the same time. (GFS does that)
> >
> > If you don't need live migration, you can use the loop, but when you want to
> > migrate (in a controlled manner, not failover), you have to do the following
> > steps:
> > - On Server A, stop Xen DomU
> > - On Server A, umount loop1 (drbd1)
> > - On Server A, set drbd1 from primary to secundairy
> > - On Server B, set drbd1 from secundairy to primary
> > - On Server B, mount loop1 (drbd1)
> > - On Server B, Start Xen VM.
> >
> we dont use live migration, for now.
> We just need a failover of the 1. VM goes offline we need the other
> one, with actuall data
>
> I cant use a real partition because we have some VM on that machine
> that dont need drbd replication,
> also some are alone and others just do a mysql replication(inside the VM).
>
> cheers
>
> .rupertt
>
> > Regards,
> > Robert
> >
> > --
> > *Exa-Omicron*
> > Patroonsweg 10
> > 3892 DB Zeewolde
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