[ovirt-users] ovirt vm disk space not release

Sat Jun 6 03:16:34 UTC 2015

Since thin provision in this case relates to sparse files you cannot
delete files in the VM and have the disk space reclaimed.

But ovirt since v. 3.5 is using qemu-img to copy disk images. IRC this
process should very well result in a smaller image. So, just use disk
move and move the disk images to a new storage domain and it should do
the trick.

> Yes its working for linux VM only not windows vm .

Another quite elegant way might be to use [fstrim]. But is is highly
depended of your VM config, storage domain, and needs virtio-scsi to my
knowlage.

> Thanks for your information , will try this .

Another way to avoid this altogether is to to use a compressing file
system like ZFS for your storage domain.

> nfs under ZFS files system formatted ?

On Fri, Jun 5, 2015 at 2:26 PM, Daniel Helgenberger <
daniel.helgenberger at m-box.de> wrote:

>
>
> On 05.06.2015 07:58, smiling dream wrote:
> > Thanks for you reply .
> > So if I understand you correctly you want to reduce the space a thin
> provision
> > disk takes up on the NFS share because you deleted files within the VM?
> > Yes
> >
> > Is there any others way to reclaim disk space ,
> Since thin provision in this case relates to sparse files you cannot
> delete files in the VM and have the disk space reclaimed.
>
> But ovirt since v. 3.5 is using qemu-img to copy disk images. IRC this
> process should very well result in a smaller image. So, just use disk
> move and move the disk images to a new storage domain and it should do
> the trick.
>
> Another quite elegant way might be to use [fstrim]. But is is highly
> depended of your VM config, storage domain, and needs virtio-scsi to my
> knowlage.
>
> Another way to avoid this altogether is to to use a compressing file
> system like ZFS for your storage domain.
>
> HTH
>
> [fstrim]
>
> http://dustymabe.com/2013/06/11/recover-space-from-vm-disk-images-by-using-discardfstrim/
>
>   coz i have bulks of vm under
> > thin provision manual process kind of impossible . As i know Vmware have
> this
> > kind of facility to reclaim from thin provision .
> >
> > On Fri, Jun 5, 2015 at 11:48 AM, Alex McWhirter <
> alexmcwhirter at triadic.us
> > <mailto:alexmcwhirter at triadic.us>> wrote:
> >
> >      Sorry, I must have misunderstood.
> >
> >      So if I understand you correctly you want to reduce the space a thin
> >      provision disk takes up on the NFS share because you deleted files
> within
> >      the VM?
> >
> >      I'm pretty sure that thin provisioned disks can only grow. Once
> they have
> >      been expanded there's no way to reclaim that space on the NFS share.
> >
> >      The only thing I think you can do is create a new thin provisioned
> disk and
> >      copy the old data over at the file level, not the block level.
> Afterwards
> >        you could delete the original disk.
> >
> >      Sent from my iPhone
> >
> >      On Jun 5, 2015, at 1:19 AM, smiling dream <smiling.dream at gmail.com
> >      <mailto:smiling.dream at gmail.com>> wrote:
> >
> >>     I mean vm internal disk space .
> >>     All of VM under thin provision . If i delete files and free space
> from VM
> >>     still ovirt stroage showing vm disk space is used . How to reclaim
> disk
> >>     space from guest VM .
> >>
> >>     On Fri, Jun 5, 2015 at 11:14 AM, Alex McWhirter <
> alexmcwhirter at triadic.us
> >>     <mailto:alexmcwhirter at triadic.us>> wrote:
> >>
> >>         From what I understand, ovirt simply reports the available
> storage
> >>         that the NFS server says it is free. Ovirt itself doesn't
> control the
> >>         storage.
> >>
> >>         Under the storage tab click on the storage domain you're having
> issues
> >>         with and check to see if the images themselves have been
> deleted or if
> >>         they are still there. When you delete a virtual machine you
> have the
> >>         option to delete the virtual image as well.
> >>
> >>         If a virtual machine has more than one image then I'm not sure
> how
> >>         this is handled as I've only used single images for virtual
> machines.
> >>         Any additional storage I need I handle over NFS directly to the
> >>         virtual machine.
> >>
> >>         Perhaps ovirt doesn't automatically delete secondary images?
> Either
> >>         way you should be able to delete them manually and reclaim
> space.
> >>
> >>         Sent from my iPhone
> >>
> >>         > On Jun 5, 2015, at 12:39 AM, smiling dream <
> smiling.dream at gmail.com
> >>         <mailto:smiling.dream at gmail.com>> wrote:
> >>         >
> >>         > I have ovirt 3.5.1 installed with VDSM 4.16.14 EL6 node and
> NFS as
> >>         storage . In my infrastructure i have multiple instance of
> centos /
> >>         windows vm under ovirt and once guest vm disk space is used
> ovirt is
> >>         not release guest vm disk space after delete .
> >>         > Looking for help .
> >>         >
> >>         > Regards
> >>         > Suvro
> >>         > _______________________________________________
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> >>         > Users at ovirt.org <mailto:Users at ovirt.org>
> >>         > http://lists.ovirt.org/mailman/listinfo/users
> >>
> >>
> >
>
> --
> Daniel Helgenberger
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