[ovirt-users] Ovirt 4.2pre Moving disks when VM is running

[Arman Khalatyan]

hi Sahni,
thanks for the details.
Looks like the live storage migration might fail on the heavy loaded
virtual machines. I just tried to move from nfs to iscsi storage(most of
the cases they moved w/o error), the message on the move dialog warns us
"! moving following disks when VM is running", if we press "ok ! do it" what
are the consequences? it is not explained in the docs.
thank you beforehand
Arman.

Am 26.11.2017 2:12 nachm. schrieb "Shani Leviim" <sleviim at redhat.com>:

Hi Arman,
VM's migration and disks migration are two different things:

- Live storage migration:
A VM's disk can be moved to another storage domain while the VM is running,
by copying the disk's structure the destination domain.
The hard part of live storage migration is moving the active layer volumes
from one domain to another, while the VM is writing to those volumes.
By using a replication operation, the data is written to both source and
destination volumes.
When both volumes contain the same data, the block job operation can be
aborted, pivoting to the new disk.

You may find more detailed information here: https://www.ovirt.org/develop/
release-management/features/storage/live-storage-migration-between-mixed-
domains/

- Live migration:
Provides the ability to move a running virtual machine between physical
hosts with no interruption to service.
The virtual machine remains powered on and user applications continue to
run while the virtual machine is relocated to a new physical host.
A running virtual machine can be live migrated to any host within its
designated host cluster.
Live migration of virtual machines does not cause any service interruption.

You may find some more information here: https://access.redhat.com/
documentation/en-US/Red_Hat_Enterprise_Virtualization/3.5/
html/Administration_Guide/sect-Migrating_Virtual_
Machines_Between_Hosts.html#What_is_live_migration

Hope it helps!


*Regards,*

*Shani Leviim*

On Fri, Nov 24, 2017 at 11:54 AM, Arman Khalatyan <arm2arm at gmail.com> wrote:

> hi,
> I have some test enviroment with ovirt
> "4.2.0-0.0.master.20171114071105.gitdfdc401.el7.centos"
> 2hosts+2NFS-domains
>
> During the multiple disk movement between the domains I am getting this
> warning:
> Moving disks while the VMs are running.(this is not so scary red as in
> 4.1.x :) )
>
> What kind of problems can happen during the movement?
>
> Thanks,
> Arman.
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