[ovirt-users] Network & local disk on same host, live storage migration

[Nir Soffer]

On Thu, Apr 7, 2016 at 6:28 PM, Matthew Bohnsack <bohnsack at gmail.com> wrote:
> Thanks for your responses.
>
> Is gaining the ability to have local and shared storage domains in the same
> datacenter (and therefore host) on the roadmap? It's most certainly
> functionality we require in our virtual environment.

I don't think it is on our roadmap at least not for the next release or two.

Can you explain why this feature is required?

Nir

>
> On Thu, Apr 7, 2016 at 8:44 AM, Alexander Wels <awels at redhat.com> wrote:
>>
>> On Thursday, April 07, 2016 07:47:59 AM Matthew Bohnsack wrote:
>> > Hello.
>> >
>> > I've been doing some experimentation with oVirt 3.6 and CentOS 7.2
>> > hosts,
>> > and I have a few high level questions, related to what I've seen in my
>> > testing:
>> >
>> > 1/ It seems that for a given host, it's impossible to have both a local
>> > storage domain and a shared storage domain such as NFS.  Is this
>> > correct?
>> > If so, is adding this capability on the roadmap somewhere?  I would
>> > really
>> > like to have the ability for a single host to simultaneously support
>> > both
>> > local and network disks.
>> >
>>
>> Storage is defined on a data center level, not on a host level, so you are
>> correct you cannot have local storage and shared storage in the same data
>> center.
>>
>> > 2/ Does oVirt support any sort of live storage migration functionality?
>> >
>>
>> Yes, if you go to the disks main tab, you can select the disk you want to
>> migrate and click 'move'. This will give you a dialog that allows you to
>> select the target storage domain and profile.
>>
>> >   2.A/ For example, say I have one host (host#1) with two separate NFS
>> > storage domains (NFS#1 and NFS#2).  In this case,  can a VM on host#1
>> > associated with NFS#1 be live migrated to NFS#2 storage?  Or can this
>> > sort
>> > of storage movement only be accomplished by a shutdown of the VM and an
>> > export/import/restart workflow?
>> >
>> >   2.B/ Is the scenario described in 2.A possible across two different
>> > hosts
>> > that share both NFS storage domains?  That is, can a VM guest on
>> > host#1/NFS#1 be live migrated to host#2/NFS#2?
>> >
>>
>> See above answer, you can live migrate between storage domains, and since
>> storage domains are at a data center level if both hosts are in the same
>> data
>> center, and both storage domains are in the same data center, you can live
>> migrate the storage as well as the VMs. It will be 2 separate operations
>> though.
>>
>> > 3/ Let's says that you setup a host (host#1) with a shared storage
>> > domain
>> > (NFS#1) and a second host (host#2) with a local storage domain
>> > (local#2).
>> > If you wanted to move a VM from host#1/NFS#1 to host#2/local#2, how
>> > would
>> > you most easily accomplish this?  All I could come up with is: Add NFS
>> > export domain to host#1, turn VM on host#1 off, export VM, add NFS
>> > import
>> > domain to host#2, import VM, on host#2 onto local#2, turn VM on on
>> > host#2?
>> >
>>
>> Since these hosts cannot be in the same data center (cannot mix shared and
>> local storage) that is the only option I know of for this particular
>> scenario.
>>
>> > Thanks for your help,
>> >
>> > -Matthew
>>
>
>
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