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@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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