Re: gluster and kvm livemigration

[Josh Boon <gluster@xxxxxxxxxxxx>]

Hey Bernhard,

I've always needed the

server.allow-insecure: on

for successful migrations.  

Also, I've not had any issues with cache=none with my machines.  A copy of a disk segment from one of my working machines

<disk type='network' device='disk'>
<driver name='qemu' type='raw' cache='none'/>
<source protocol='gluster' name='VMARRAY/HFMMNG1.img'>
<host name='10.9.1.2' port=''/>
</source>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</disk>

Best,

Josh

---

From: "Bernhard Glomm" <bernhard.glomm@xxxxxxxxxxx>
To: pkarampu@xxxxxxxxxx
Cc: gluster-users@xxxxxxxxxxx
Sent: Thursday, January 16, 2014 9:02:54 AM
Subject: Re: gluster and kvm livemigration

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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