Re: [Engine-devel] Disk Cloning When Creating a VM via a Template
Okay, I'll have a look at master and play around with things a little bit. Thanks for
that insight, Ayal! So, when a VM is cloned from a template, all disks associated with
the template are cloned to go with the new VM, correct? Could I do something similar with
the floating disks and just clone all of the associated disks from a VM? In the meantime,
I'll read up a bit more on Floating Disks on the feature pages on the wiki. Thanks
again!
-- Dustin
-----Original Message-----
From: Ayal Baron [mailto:abaron@redhat.com]
Sent: Sunday, April 29, 2012 6:25 AM
To: Livnat Peer
Cc: engine-devel(a)ovirt.org; Schoenbrun, Dustin
Subject: Re: [Engine-devel] Disk Cloning When Creating a VM via a Template
----- Original Message -----
On 26/04/12 22:24, Schoenbrun, Dustin wrote:
> I know that floating disks are coming in the next version of oVirt,
> but in the interim I want to know internally what the procedure is
> when a disk is cloned when creating a VM from a template.
I'm not sure what floating disks have to do with it (it would be relevant for cloning
a single disk, not cloning an entire VM).
For cloning a single disk I believe that floating disk is already available in master by
the way.
>
Hi,
Today when creating a VM from template the user can choose the
provisioning method:
- It can be 'Thin' in which the engine is taking a snapshot of the
template disks (running AddVMCommand which executes
CreateSnapshotFromTemplateCommand)
- Or 'Clone' which results in cloning the template disks (executes
AddVmFromTemplateCommand which in turn executes
CreateCloneOfTemplateCommand)
For createCloneOfTemplateCommand, other than the VM configuration being copied, the engine
creates copies of all of the template images (calls moveImage in vdsm per Image).
Thanks, Livnat
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