4:01 p.m.
I have attached 7TB disk ( pre allocated) for VM ( Redhat 8 ).. Due to
some space issue we have unattached disk from VM and deleted it. but free
space still has not changed and we can't use that space for other purposes
.
What would be the issue ?
Thanks,
Ranesh..
4:31 p.m.
Attaching disk -> how, where ?
Best Regards,Strahil Nikolov
On Sun, Jul 11, 2021 at 17:02, Ranesh Tharanga Perera<raneshtharanga(a)gmail.com>
wrote: I have attached 7TB disk ( pre allocated) for VM ( Redhat 8 ).. Due to some
space issue we have unattached disk from VM and deleted it. but free space still has not
changed and we can't use that space for other purposes .
What would be the issue ?
Thanks,Ranesh.._______________________________________________
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9:39 p.m.
On Sun, Jul 11, 2021 at 5:03 PM Ranesh Tharanga Perera
<raneshtharanga(a)gmail.com> wrote:
I have attached 7TB disk ( pre allocated) for VM ( Redhat 8 ).. Due to some space issue
we have unattached disk from VM and deleted it.
Did you enable the "discard after delete" option in the storage domain
advanced options?
If you did not, the logical volume is deleted, but the blocks allocated on the
server side from this logical volume are not discarded.
Since you deleted the logical volume, it is not possible to discard it
now, but you
do this:
Try this:
- Put the storage domain to maintenance
- Enable "discard-after delete"
- Active the storage domain
- Create new raw preallocated disk filling the entire domain
- Delete the disk
Nir
11:26 p.m.
We have enabled both options discard-after delete and wipe after delete
but nothing is working , I have tried to creating small disk ( like 1 GB ).
after deleting that disk space has reclaimed succsuuufully.
Seems this happens for larger size disk
On Mon, Jul 12, 2021 at 1:10 AM Nir Soffer <nsoffer(a)redhat.com> wrote:
On Sun, Jul 11, 2021 at 5:03 PM Ranesh Tharanga Perera
<raneshtharanga(a)gmail.com> wrote:
>
> I have attached 7TB disk ( pre allocated) for VM ( Redhat 8 ).. Due to
some space issue we have unattached disk from VM and deleted it.
Did you enable the "discard after delete" option in the storage domain
advanced options?
If you did not, the logical volume is deleted, but the blocks allocated
on the
server side from this logical volume are not discarded.
Since you deleted the logical volume, it is not possible to discard it
now, but you
do this:
Try this:
- Put the storage domain to maintenance
- Enable "discard-after delete"
- Active the storage domain
- Create new raw preallocated disk filling the entire domain
- Delete the disk
Nir
12:15 a.m.
On Mon, Jul 12, 2021 at 12:27 AM Ranesh Tharanga Perera
<raneshtharanga(a)gmail.com> wrote:
We have enabled both options discard-after delete and wipe after delete but nothing is
working , I have tried to creating small disk ( like 1 GB ). after deleting that disk
space has reclaimed succsuuufully.
Seems this happens for larger size disk
If it worked for 1g disk, it should work for a bigger disk.
If you can reproduce this again, please file a ovirt/vdsm bug and attach
vdsm logs and /var/log/messages (or output of journalcltl).
BTW, do you have a real need for wipe-after-delete? This can make
deletion much slower, since it may need to allocate the entire disk on
the server side for writing zeroes just to deallocate all space right
after that when we discard the disk.
This option is needed only if you want to ensure that sensitive data
cannot leak to another disk on the same storage, maybe used by
another tenant.
On Mon, Jul 12, 2021 at 1:10 AM Nir Soffer <nsoffer(a)redhat.com>
wrote:
>
> On Sun, Jul 11, 2021 at 5:03 PM Ranesh Tharanga Perera
> <raneshtharanga(a)gmail.com> wrote:
> >
> > I have attached 7TB disk ( pre allocated) for VM ( Redhat 8 ).. Due to some
space issue we have unattached disk from VM and deleted it.
>
> Did you enable the "discard after delete" option in the storage domain
> advanced options?
>
> If you did not, the logical volume is deleted, but the blocks allocated on the
> server side from this logical volume are not discarded.
>
> Since you deleted the logical volume, it is not possible to discard it
> now, but you
> do this:
>
> Try this:
> - Put the storage domain to maintenance
> - Enable "discard-after delete"
> - Active the storage domain
> - Create new raw preallocated disk filling the entire domain
> - Delete the disk
>
> Nir
5:58 a.m.
Many thanks for the info.
We don't need that option. How we can disable that? just only uncheck that
property box ? Is there any downtime?
What happens if we delete that VM and recreate it? All space will reclaim?
Thanks,
Ranesh..
On Mon, Jul 12, 2021 at 3:46 AM Nir Soffer <nsoffer(a)redhat.com> wrote:
On Mon, Jul 12, 2021 at 12:27 AM Ranesh Tharanga Perera
<raneshtharanga(a)gmail.com> wrote:
>
> We have enabled both options discard-after delete and wipe after delete
but nothing is working , I have tried to creating small disk ( like 1 GB ).
after deleting that disk space has reclaimed succsuuufully.
> Seems this happens for larger size disk
If it worked for 1g disk, it should work for a bigger disk.
If you can reproduce this again, please file a ovirt/vdsm bug and attach
vdsm logs and /var/log/messages (or output of journalcltl).
BTW, do you have a real need for wipe-after-delete? This can make
deletion much slower, since it may need to allocate the entire disk on
the server side for writing zeroes just to deallocate all space right
after that when we discard the disk.
This option is needed only if you want to ensure that sensitive data
cannot leak to another disk on the same storage, maybe used by
another tenant.
> On Mon, Jul 12, 2021 at 1:10 AM Nir Soffer <nsoffer(a)redhat.com> wrote:
>>
>> On Sun, Jul 11, 2021 at 5:03 PM Ranesh Tharanga Perera
>> <raneshtharanga(a)gmail.com> wrote:
>> >
>> > I have attached 7TB disk ( pre allocated) for VM ( Redhat 8 ).. Due
to some space issue we have unattached disk from VM and deleted it.
>>
>> Did you enable the "discard after delete" option in the storage
domain
>> advanced options?
>>
>> If you did not, the logical volume is deleted, but the blocks
allocated on the
>> server side from this logical volume are not discarded.
>>
>> Since you deleted the logical volume, it is not possible to discard it
>> now, but you
>> do this:
>>
>> Try this:
>> - Put the storage domain to maintenance
>> - Enable "discard-after delete"
>> - Active the storage domain
>> - Create new raw preallocated disk filling the entire domain
>> - Delete the disk
>>
>> Nir
5:14 p.m.
On Mon, Jul 12, 2021 at 7:00 AM Ranesh Tharanga Perera
<raneshtharanga(a)gmail.com> wrote:
Many thanks for the info.
We don't need that option. How we can disable that? just only uncheck that property
box ? Is there any downtime?
What happens if we delete that VM and recreate it? All space will reclaim?
You need to put the domain to maintenance, uncheck the option
and activate the domain.
If you have vms using this domain, you need to shut them down,
or migrate the disk to another storage, and then migrate the vm
back to the storage.
Since migrating the disk requires coping the disks twice, maybe it
is better to create a new LUN(s) on the server side, create a new
storage domain (without wipe-after-delete), and migrate the disks
to the new storage domain (no downtime required). Finally when
old storage domain is unused, remove it. With this flow you need
to copy the data only once.
If you can have short downtime, maybe during a maintenance window
shutting down the vms and modifying the domain may be better.
I'm not sure why we require moving a storage domain to maintenance
for changing such configuration, this sounds completely unnessercery,
so I think RFE for allowing online configuration changes is a good idea.
Nir
Thanks,
Ranesh..
On Mon, Jul 12, 2021 at 3:46 AM Nir Soffer <nsoffer(a)redhat.com> wrote:
>
> On Mon, Jul 12, 2021 at 12:27 AM Ranesh Tharanga Perera
> <raneshtharanga(a)gmail.com> wrote:
> >
> > We have enabled both options discard-after delete and wipe after delete but
nothing is working , I have tried to creating small disk ( like 1 GB ). after deleting
that disk space has reclaimed succsuuufully.
> > Seems this happens for larger size disk
>
> If it worked for 1g disk, it should work for a bigger disk.
>
> If you can reproduce this again, please file a ovirt/vdsm bug and attach
> vdsm logs and /var/log/messages (or output of journalcltl).
>
> BTW, do you have a real need for wipe-after-delete? This can make
> deletion much slower, since it may need to allocate the entire disk on
> the server side for writing zeroes just to deallocate all space right
> after that when we discard the disk.
>
> This option is needed only if you want to ensure that sensitive data
> cannot leak to another disk on the same storage, maybe used by
> another tenant.
>
> > On Mon, Jul 12, 2021 at 1:10 AM Nir Soffer <nsoffer(a)redhat.com> wrote:
> >>
> >> On Sun, Jul 11, 2021 at 5:03 PM Ranesh Tharanga Perera
> >> <raneshtharanga(a)gmail.com> wrote:
> >> >
> >> > I have attached 7TB disk ( pre allocated) for VM ( Redhat 8 ).. Due
to some space issue we have unattached disk from VM and deleted it.
> >>
> >> Did you enable the "discard after delete" option in the storage
domain
> >> advanced options?
> >>
> >> If you did not, the logical volume is deleted, but the blocks allocated on
the
> >> server side from this logical volume are not discarded.
> >>
> >> Since you deleted the logical volume, it is not possible to discard it
> >> now, but you
> >> do this:
> >>
> >> Try this:
> >> - Put the storage domain to maintenance
> >> - Enable "discard-after delete"
> >> - Active the storage domain
> >> - Create new raw preallocated disk filling the entire domain
> >> - Delete the disk
> >>
> >> Nir
>
_______________________________________________
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1041
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1042
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6 comments
3 participants
participants (3)
-
Nir Soffer -
Ranesh Tharanga Perera -
Strahil Nikolov