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[Qemu-discuss] raw block -> RBD live migration

From: Nikola Ciprich
Subject: [Qemu-discuss] raw block -> RBD live migration
Date: Wed, 13 Jan 2016 08:29:23 +0100
User-agent: Mutt/1.5.21 (2011-07-01)

Hello qemu users,

I'd like to ask about nonshared migration..

I have a server with virtual machines running on raw block devices..
I'd like to migrate those to ceph / RBD storage without downtime.

I've tested following procedure (I'm using qemu-kvm + libvirt based management)

1) create RBD devices of the same size
2) create new XML domain definition file with storage changed to new RBD 
devices (vm-new.xml)
3) migrate vm using libvirt:
migrate --verbose --xml /tmp/vm-new.xml --copy-storage-all --live vmlbx50 

this seemed to do the trick, I've tested it for both linux and windows machines.

however, one windows 2k12 machine slowed down badly after migration, and after 
chkdisk showed lots of corrupted filesystem indexes (i'm not windows guru, so
hopefully I'm not confusing this much). After fixing those, everything started
working OK again, but I'm now concerned whether this procedure is really safe..

is there enybody who could confirm or comment on this?
I'm using qemu-2.2.1 and libvirt 1.2.6 on source machine,
qemu-2.3.0 and libvirt 1.2.15 on target box..

thanks a lot in advance!



Ing. Nikola CIPRICH
LinuxBox.cz, s.r.o.
28.rijna 168, 709 00 Ostrava

tel.:   +420 591 166 214
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