[Gluster-users] gluster and kvm livemigration

[Bernhard Glomm]

btw:

The VM are configured to use cache=writethrough
since cache=none doesn't work (can't install the machine
because of i/o errors when I try to use the disk)
can't start an installed machine with cache=none
with cache=writethrough and cache=writeback
the machines starts and runs, but lifemigration
shows both time the same issue that
the disk will become readonline on successful migration
remount, reboot failed
only a shutdown and a restart works.

TIA

Bernhard 


> > I experienced a strange behavior of glusterfs during livemigration
> > of a qemu-kvm guest
> > using a 10GB file on a mirrored gluster 3.4.2 volume
> > (both on ubuntu 13.04)
> > I run
> > virsh migrate --verbose --live --unsafe --p2p --domain atom01 --desturi
> > qemu+ssh://<target_ip>/system
> > and the migration works,
> > the running machine is pingable and keeps sending pings.
> > nevertheless, when I let the machine touch a file during migration
> > it stops, complaining that it's filesystem is read only (from that moment
> > that
> > migration finished)
> > A reboot from inside the machine failes,
> > machine goes down and comes up with an error
> > unable to write to sector xxxxxx on hd0
> > (than falling into the initrd).
> > a
> > virsh destroy VM && virsh start VM
> > leads to a perfect running VM again,
> > no matter on which of the two hosts I start the machine
> > anybody better experience with livemigration?
> > any hint on a procedure how to debug that?


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