[one-users] Thin provisioning and image size

[Javier Fontan]

Which was the size of the original image? I think that when you do a
save_as (deferred disk snapshot) it just copies the size of the
original image to the new one.

On Tue, Sep 2, 2014 at 2:09 PM, Daniel Dehennin
<daniel.dehennin at baby-gnu.org> wrote:
> Hello,
>
> The size of my qcow2 images is always reported as 1M:
>
>     IMAGE 114 INFORMATION
>     ID             : 114
>     NAME           : debian-wheezy
>     USER           : nebula
>     GROUP          : nebula
>     DATASTORE      : default
>     TYPE           : OS
>     REGISTER TIME  : 04/10 10:18:26
>     PERSISTENT     : No
>     SOURCE         :
>     /var/lib/one/datastores/1/5d2be6f9746fc3447be11c6621da87df
>     FSTYPE         : save_as
>     SIZE           : 1M
>     STATE          : rdy
>     RUNNING_VMS    : 0
>
>     PERMISSIONS
>     OWNER          : um-
>     GROUP          : u--
>     OTHER          : u--
>
>     IMAGE TEMPLATE
>     DEV_PREFIX="vd"
>     DRIVER="qcow2"
>     SAVED_DISK_ID="0"
>     SAVED_IMAGE_ID="17"
>     SAVED_VM_ID="347"
>     SAVE_AS="YES"
>
> As far as I understand, the size is calculated only at creation time and
> never updated.
>
> I think we could differentiate the real size from the virtual size in
> case of thin provisioning like qcow2, qemu-img actually reports:
>
>     qemu-img info /var/lib/one/datastores/1/5d2be6f9746fc3447be11c6621da87df
>     image: /var/lib/one/datastores/1/5d2be6f9746fc3447be11c6621da87df
>     file format: qcow2
>     virtual size: 40G (42949672960 bytes)
>     disk size: 629M
>     cluster_size: 65536
>     Format specific information:
>         compat: 1.1
>         lazy refcounts: false
>
> Regards.
>
> --
> Daniel Dehennin
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-- 
Javier Fontán Muiños
Developer
OpenNebula - Flexible Enterprise Cloud Made Simple
www.OpenNebula.org | @OpenNebula | github.com/jfontan