On Thu, Mar 31, 2016 at 1:05 PM, Grundmann, Christian <Christian.Grundmann@fabasoft.com> wrote:

Hi,
seems not to work with FC Storage,

I Zero filled the Disk with dd, removed the file and did a fstrim which told me it trimmed the right amount of space,
But the disk Image stays full size.

1. Did you use the hook?

2. Where did you see it's the same size? Should be looked at from the storage side (assuming, btw, it supports discard!)

Thx
Christian

Von: Yaniv Kaul [mailto:ykaul@redhat.com]
Gesendet: Mittwoch, 30. März 2016 22:29
An: Grundmann, Christian <Christian.Grundmann@fabasoft.com>
Cc: users@ovirt.org
Betreff: Re: [ovirt-users] Reclaim disk space of thin disks

On Wed, Mar 30, 2016 at 10:04 AM, Grundmann, Christian <Christian.Grundmann@fabasoft.com> wrote:
Hi,
is there a way to „shrink“ a thin disk image to reclaim deleted space like using virt-sparsify?

Yes, if the underlying file system supports it (NFS, for example, might need to be 4.2 and above).

Or can it be done by making a snapshot and clone the VM to a new one?

Another suggestion: use the VDSM hooks for discard ('diskunmap') and run 'fstrim' from within the guest.
Y.

Thanks a lot
Christian

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