[one-users] Question about 3.8.1 TM premigrate

[Ruben S. Montero]

Hi,

Probably this is not very well explained in the documentation. Notes on
premigrate/postmigrate:

1.- These scripts are to be executed before and after calling the
live-migrate operation of the hypervisor

2.- The pre/post migrate scripts are place holders to put all the
operations needed to work with the VM disks before/after the live-migration

3.- The scripts are not called for each DISK but just once for the whole
VM. Within the scripts you can iterate over the disks.

4.- As the VM is running, it is homed in the system datastore, so the
scripts invoked are those of the TM used by the system datastore (shared in
your case)

As you suggest, in you case you just need to copy the pre/postmigrate
scripts from the eqliscsi TM to the shared one.

Hope it is a bit clearer now

Cheers

Ruben


On Mon, Nov 19, 2012 at 11:15 AM, Joaquin Villanueva <jvillanueva at acb.es>wrote:

>  Hi all,
>
> After succesful update from 3.6 to 3.8.1, we're testing the
> premigrate/postmigrate feature. We're using a shared system datastore, and
> all the VM have iscsi volumes attached. The premigrate feature is really
> useful for this scenario, letting us to login into the iscsi volumes before
> migration without need for a more complex setup involving qemu scripts at
> the hosts.
>
> We're using a modified version of the iscsi DATASTORE / TM drivers,
> adapted to our Equallogic setup. These drivers are added to the opennebula
> config as new driver (eqliscsi), and all the other features run as expected.
>
> But there's some questions about the premigrate/postmigrate feature:
>
> - There's premigrate/postmigrate scripts at every TM driver, but the only
> one called when doing a VM migration was the shared TM.
> - The eqliscsi TM premigrate scripts must be called from the shared TM?
> - It's planed to call every premigrate script from every datastore used
> inside the VM?
>
> I'm thinking in a scenario where one VM has different disks from different
> datastores attached and need to do some operations before/after migration.
> The premigrate/postmigrate scripts must be called at least for every
> different TM driver needed.
>
> Maybe I'm mixing some concepts between datastore and tm drivers, but some
> help to define the correct way to manage this scenario wil be grealty
> appreciated.
>
> Best regards,
>
>
> --
>
>
>    *Joaquín Villanueva Adrián*
>
> Director Técnico ACB.COM
>
>    <http://www.acb.com/>
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-- 
Ruben S. Montero, PhD
Project co-Lead and Chief Architect
OpenNebula - The Open Source Solution for Data Center Virtualization
www.OpenNebula.org | rsmontero at opennebula.org | @OpenNebula
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