Re: KVM+Ceph: Live migration of I/O-heavy VM

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We are using qemu storage migration regularly via proxmox

Works fine, you can go on


On 12/11/2018 05:39 PM, Lionel Bouton wrote:
> 
> I believe OP is trying to use the storage migration feature of QEMU.
> I've never tried it and I wouldn't recommend it (probably not very
> tested and there is a large window for failure).
> 
> One tactic that can be used assuming OP is using LVM in the VM for
> storage is to add a Ceph volume to the VM (probably needs a reboot) add
> the corresponding virtual disk to the VM volume group and then migrate
> all data from the logical volume(s) to the new disk. LVM is using
> mirroring internally during the transfer so you get robustness by using
> it. It can be slow (especially with old kernels) but at least it is
> safe. I've done a DRBD to Ceph migration with this process 5 years ago.
> When all logical volumes are moved to the new disk you can remove the
> old disk from the volume group.
> 
> Assuming everything is on LVM including the root filesystem, only moving
> the boot partition will have to be done outside of LVM.
> 
> Best regards,
> 
> Lionel
> 
> 
> 
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> 

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