[Users] Clarification - Thin Disk

Itamar Heim iheim at redhat.com
Thu Dec 19 21:43:17 UTC 2013

On 12/19/2013 07:54 AM, Markus Stockhausen wrote:
> Hello,
> could someone clarify the term "thin disk" in the context of Templates.
> Up to now for me a thin disk is space that is allocated on demand.
> But if I create VM from a template and use type "Thin" it must be a
> little bit different. The newly created VM will operate on the frozen
> template data plus some delta file that stores the changed block.
> Is that right? Shouldn't that be a "linked-disk"?

thin doesn't mean it has a snapshot, only its not pre-allocating the 
entire storage needed iirc.

> Extra question: Why can't I move a (thin provisioned) template disk
> and instead have to copy it and delete it afterwards?

just wasn't a prominent use case to implement i guess (would also need 
to check no VMs/disks derive from the template of course).

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