[ovirt-users] Reclaim disk space of thin disks

[Grundmann, Christian]

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.

 

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 <mailto: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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