[ovirt-users] Reclaim disk space of thin disks

[Yaniv Kaul]

On Thu, Mar 31, 2016 at 1:05 PM, Grundmann, Christian <
Christian.Grundmann at 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!)
Y.


>
> Thx
>
> Christian
>
>
>
> *Von:* Yaniv Kaul [mailto:ykaul at redhat.com]
> *Gesendet:* Mittwoch, 30. März 2016 22:29
> *An:* Grundmann, Christian <Christian.Grundmann at fabasoft.com>
> *Cc:* users at 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 at 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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