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

[Steffen Weißgerber]

Hi,

before doing this migration

1. Did you test a migration to non-rbd storage succesfully without this
bad behavior after migration?

2. Did you install and run another vm on your rbd storage? Does this vm perform 
normally?

Regards

Steffen


>>> Nikola Ciprich <address@hidden> schrieb am Mittwoch, 13. Januar
2016 um 08:29:
> 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 
> qemu+tcp://lbxphav1a/system
> 
> 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 reboot,
> 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!
> 
> BR
> 
> nik
> 
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> LinuxBox.cz, s.r.o.
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