[ovirt-users] How to change disk from thin to pre allocated

[Gianluca Cecchi]

On Thu, Feb 9, 2017 at 4:11 PM, <ovirt at timmi.org> wrote:

> Hi Gianluca,
>
> I tried to clone the VM but it does not help. It is still thin allocation.
>
> Best regards
> Christoph
>
>
>
Hi,
I referred to this information for the clone of VM scenario:
http://lists.ovirt.org/pipermail/users/2016-May/040129.html
that contains:

"
>What happens if you clone a source VM which is using "thin" ?
The VM cloned from a thin templated base VM will be created with a full
copy of the disk (as in "Clone" when creating from template)
"
but I have not tried myself recently with 4.0/4.1 versions

Instead I did test some days ago with 4.0.6 this scenario below as I wanted
to convert a source thin provisioned VM to a preallocated template:
VM is powered on
create a snapshot of the VM
select the snapshot line and select clone
in resource allocation section of the new vm screen change allocation
policy for the desired disk/s from thin provision to preallocated
Then you can decommission old VM and use the cloned one
Verified today in 4.1 too.

Or from the snapshot line you can also "make template" if you plan to use
it as a base for more VMs.
But in this case (tested in 4.1) your options are shown in a "Format"
column, not "Allocation Policy" column; and you can choose between QCOW2
(that should be thin) and Raw (that should be preallocated).
See my screenshot:
https://drive.google.com/file/d/0BwoPbcrMv8mvTHIzTU5kdHVJOG8/view?usp=sharing
Probably it should be made consistent and show "Allocation Policy" instead
and related values?

Gianluca
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