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

[ovirt at timmi.org]

Hi Gianluca,

thank you for the feedback with the templates.
I will take a look into it.

Best regards
Christoph

Am 09.02.2017 um 21:12 schrieb Gianluca Cecchi:
>
> On Thu, Feb 9, 2017 at 4:46 PM, Gianluca Cecchi 
> <gianluca.cecchi at gmail.com <mailto:gianluca.cecchi at gmail.com>> wrote:
>
>     On Thu, Feb 9, 2017 at 4:11 PM, <ovirt at timmi.org
>     <mailto: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
>     <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
>     <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
>
>
>
>
>
>
> Hi,
> I just tested this on 4.1:
> - take a VM with a thin provisioned disk
> How to see allocation policy?
> It seems suboptimal for me: I would expect to see this kind of 
> information in disks sub pane of the vm.
> Instead I have to select snaphsots sub pane, then for example the 
> "Current' line, and at the right side sub pane in disks tab I see 
> "Allocation Policy" - thin provision
>
> - make a clone of it in a new VM
> In the same sub pane for the new VM I see preallocated.... so it seems 
> to work as I read
> This is on FC-SAN. What kind of storage is yours?
>
>

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