[Gluster-users] gluster and kvm livemigration

[Paul Boven]

Hi James, everyone,

When debugging things, I already came across this bug. It is unlikely to 
be the cause of our issues:

Firstly, we migrated from 3.4.0 to 3.4.1, so we already had the possible 
port number conflict, but things worked fine with 3.4.0.

Secondly, I don't see the 'address already in use' messages in my 
logfiles (see the qemu logfiles I posted).

Also, the migration itself doesn't fail: it works fine, the guest ends 
up on the other server, it's just that the migrated guest loses 
read/write access to its filesystem.

Regards, Paul Boven.

On 01/24/2014 01:19 AM, James wrote:
> Not sure if it's related at all, but is there any chance this has
> anything to do with:
>
> https://bugzilla.redhat.com/show_bug.cgi?id=987555
>
> It came to mind as something to do with glusterfs+libvirt+migration.
>
> HTH,
> James
>
>
>
> On Thu, Jan 16, 2014 at 5:52 AM, Bernhard Glomm
> <bernhard.glomm at ecologic.eu <mailto:bernhard.glomm at ecologic.eu>> wrote:
>
>     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?
>     TIA
>     Bernhard
>
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-- 
Paul Boven <boven at jive.nl> +31 (0)521-596547
Unix/Linux/Networking specialist
Joint Institute for VLBI in Europe - www.jive.nl
VLBI - It's a fringe science