[Engine-devel] Disk Cloning When Creating a VM via a Template

[Schoenbrun, Dustin]

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 at redhat.com] 
Sent: Sunday, April 29, 2012 6:25 AM
To: Livnat Peer
Cc: engine-devel at 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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