[Users] scheduling storage migration

[Itamar Heim]

On 04/04/2014 03:34 PM, Jorick Astrego wrote:
>
> On Fri, 2014-04-04 at 15:02 +0300, Itamar Heim wrote:
>> On 04/04/2014 10:51 AM, Jorick Astrego wrote:
>> > Hi,
>> >
>> > I don't know if it's possible yet but can we schedule the (live) storage
>> > migration?
>> >
>> > It would be awesome to have for example some VM data on SSD storage that
>> > migrates to HDD storage when the VM is shutdown. Or have VM's with high
>> > IO load during specific times migrate to a high IO storage domain during
>> > these hours.
>>
>> if the VM is down, you can move it, not (live) storage migration.
>> >
>> > I realize it will generate extra load while migrating but this can be
>> > planned for. Maybe the guys from glusterfs could enable storage
>> > migration on their side so the migration can execute on the storage
>> > server triggered by ovirt, that would be even better performance wise.
>>
>> in any case, you can script anything with the API...
>>
>
> I was being lazy... So I can use the
> http://www.ovirt.org/Features/oVirtSchedulerAPI for this? Or do I have
> to hack around with the engine api. I will spend some time diving into it.

you can use the scheduler api, but I don't remember it having an event 
for OnVmStop.
you can also use it for a periodic "balancing" call, but for that, you 
can also just use cron.
in either case you will need to do the relevant api calls for moving the 
disks around. i'd go with the cron approach.