Re: [ovirt-users] Reclaim disk space of thin disks
On Thu, Mar 31, 2016 at 3:44 PM, Grundmann, Christian <
christian.grundm...@fabasoft.com> wrote:
> Hi,
>
> @ I'm unsure if that size should change - we've allocated blocks, they
> are still allocated from our perspective. From the storage point of view,
> there's a hole that can be used for other purposes.
>
> I'd look on the storage side.
>
>
>
> That’s the problem, if the space is still allocated it can’t be used for
> other VMs so it won’t help. Is there a possibility to deallocate the free
> Blocks of the Disk? I think virt-sparsify would do exactly that but can’t
> be used with ovirt?
>
Well, it's tricky ;-) - the space is allocated, in the sense that the
storage 'promised' to give you X GBs of storage. It just didn't say where
does blocks are going to be. So once you unmap a block, it may take it and
give it to someone else. This is what thin provisioning is all about. You
get logical blocks which map to physical blocks. Once those physical blocks
have been deallocated, they may be used by something else, yet the logical
block is still yours - and if you'll write to it, you'll get a different
physical block.
Y.
>
>
> Thx
>
> Christian
>
>
>
>
>
>
>
>
>
>
>
> *Von:* Yaniv Kaul [mailto:yk...@redhat.com]
> *Gesendet:* Donnerstag, 31. März 2016 14:33
>
> *An:* Grundmann, Christian
> *Cc:* users@ovirt.org
> *Betreff:* Re: [ovirt-users] Reclaim disk space of thin disks
>
>
>
> On Thu, Mar 31, 2016 at 1:16 PM, Grundmann, Christian <
> christian.grundm...@fabasoft.com> wrote:
>
> Hi,
>
> @1. Did you use the hook?
>
> yes, without the hook fstrim would not start,
>
> @2. Where did you see it's the same size? Should be looked at from the
> storage side (assuming, btw, it supports discard!)
>
> I looked at the “actual Size” under Storage
>
>
>
> I'm unsure if that size should change - we've allocated blocks, they are
> still allocated from our perspective. From the storage point of view,
> there's a hole that can be used for other purposes.
>
> I'd look on the storage side.
>
>
>
> I don’t know how ovirt handles FC storage and if this will allow discard.
>
>
>
> It doesn't really care - thee discard should be passed to the underlying
> storage. Most should support UNMAP these days. But you can easily check, I
> assume with a small test (use sg3_utils for example).
>
> Y.
>
>
>
>
>
> Thx
>
> Christian
>
>
>
>
>
> *Von:* Yaniv Kaul [mailto:yk...@redhat.com]
> *Gesendet:* Donnerstag, 31. März 2016 12:13
>
>
> *An:* Grundmann, Christian
> *Cc:* users@ovirt.org
> *Betreff:* Re: [ovirt-users] Reclaim disk space of thin disks
>
>
>
>
>
>
>
> On Thu, Mar 31, 2016 at 1:05 PM, Grundmann, Christian <
> christian.grundm...@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:yk...@redhat.com]
> *Gesendet:* Mittwoch, 30. März 2016 22:29
> *An:* Grundmann, Christian
> *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.grundm...@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
>
>
> ___
> Users mailing list
> Users@ovirt.org
> http://lists.ovirt.org/mailman/listinfo/users
>
>
>
>
>
>
>
___
Users mailing list
Users@ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
Re: [ovirt-users] Reclaim disk space of thin disks
Hi,
@ I'm unsure if that size should change - we've allocated blocks, they are
still allocated from our perspective. From the storage point of view, there's a
hole that can be used for other purposes.
I'd look on the storage side.
That’s the problem, if the space is still allocated it can’t be used for other
VMs so it won’t help. Is there a possibility to deallocate the free Blocks of
the Disk? I think virt-sparsify would do exactly that but can’t be used with
ovirt?
Thx
Christian
Von: Yaniv Kaul [mailto:yk...@redhat.com]
Gesendet: Donnerstag, 31. März 2016 14:33
An: Grundmann, Christian
Cc: users@ovirt.org
Betreff: Re: [ovirt-users] Reclaim disk space of thin disks
On Thu, Mar 31, 2016 at 1:16 PM, Grundmann, Christian
mailto:christian.grundm...@fabasoft.com> >
wrote:
Hi,
@1. Did you use the hook?
yes, without the hook fstrim would not start,
@2. Where did you see it's the same size? Should be looked at from the storage
side (assuming, btw, it supports discard!)
I looked at the “actual Size” under Storage
I'm unsure if that size should change - we've allocated blocks, they are still
allocated from our perspective. From the storage point of view, there's a hole
that can be used for other purposes.
I'd look on the storage side.
I don’t know how ovirt handles FC storage and if this will allow discard.
It doesn't really care - thee discard should be passed to the underlying
storage. Most should support UNMAP these days. But you can easily check, I
assume with a small test (use sg3_utils for example).
Y.
Thx
Christian
Von: Yaniv Kaul [mailto:yk...@redhat.com <mailto:yk...@redhat.com> ]
Gesendet: Donnerstag, 31. März 2016 12:13
An: Grundmann, Christian mailto:christian.grundm...@fabasoft.com> >
Cc: users@ovirt.org <mailto:users@ovirt.org>
Betreff: Re: [ovirt-users] Reclaim disk space of thin disks
On Thu, Mar 31, 2016 at 1:05 PM, Grundmann, Christian
mailto:christian.grundm...@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:yk...@redhat.com <mailto:yk...@redhat.com> ]
Gesendet: Mittwoch, 30. März 2016 22:29
An: Grundmann, Christian mailto:christian.grundm...@fabasoft.com> >
Cc: users@ovirt.org <mailto:users@ovirt.org>
Betreff: Re: [ovirt-users] Reclaim disk space of thin disks
On Wed, Mar 30, 2016 at 10:04 AM, Grundmann, Christian
mailto:christian.grundm...@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
___
Users mailing list
Users@ovirt.org <mailto:Users@ovirt.org>
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Re: [ovirt-users] Reclaim disk space of thin disks
On Thu, Mar 31, 2016 at 1:16 PM, Grundmann, Christian <
christian.grundm...@fabasoft.com> wrote:
> Hi,
>
> @1. Did you use the hook?
>
> yes, without the hook fstrim would not start,
>
> @2. Where did you see it's the same size? Should be looked at from the
> storage side (assuming, btw, it supports discard!)
>
> I looked at the “actual Size” under Storage
>
I'm unsure if that size should change - we've allocated blocks, they are
still allocated from our perspective. From the storage point of view,
there's a hole that can be used for other purposes.
I'd look on the storage side.
>
>
> I don’t know how ovirt handles FC storage and if this will allow discard.
>
It doesn't really care - thee discard should be passed to the underlying
storage. Most should support UNMAP these days. But you can easily check, I
assume with a small test (use sg3_utils for example).
Y.
>
> Thx
>
> Christian
>
>
>
>
>
> *Von:* Yaniv Kaul [mailto:yk...@redhat.com]
> *Gesendet:* Donnerstag, 31. März 2016 12:13
>
> *An:* Grundmann, Christian
> *Cc:* users@ovirt.org
> *Betreff:* Re: [ovirt-users] Reclaim disk space of thin disks
>
>
>
>
>
>
>
> On Thu, Mar 31, 2016 at 1:05 PM, Grundmann, Christian <
> christian.grundm...@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:yk...@redhat.com]
> *Gesendet:* Mittwoch, 30. März 2016 22:29
> *An:* Grundmann, Christian
> *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.grundm...@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
>
>
> ___
> Users mailing list
> Users@ovirt.org
> http://lists.ovirt.org/mailman/listinfo/users
>
>
>
>
>
___
Users mailing list
Users@ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
Re: [ovirt-users] Reclaim disk space of thin disks
Hi,
@1. Did you use the hook?
yes, without the hook fstrim would not start,
@2. Where did you see it's the same size? Should be looked at from the storage
side (assuming, btw, it supports discard!)
I looked at the “actual Size” under Storage
I don’t know how ovirt handles FC storage and if this will allow discard.
Thx
Christian
Von: Yaniv Kaul [mailto:yk...@redhat.com]
Gesendet: Donnerstag, 31. März 2016 12:13
An: Grundmann, Christian
Cc: users@ovirt.org
Betreff: Re: [ovirt-users] Reclaim disk space of thin disks
On Thu, Mar 31, 2016 at 1:05 PM, Grundmann, Christian
mailto:christian.grundm...@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:yk...@redhat.com <mailto:yk...@redhat.com> ]
Gesendet: Mittwoch, 30. März 2016 22:29
An: Grundmann, Christian mailto:christian.grundm...@fabasoft.com> >
Cc: users@ovirt.org <mailto:users@ovirt.org>
Betreff: Re: [ovirt-users] Reclaim disk space of thin disks
On Wed, Mar 30, 2016 at 10:04 AM, Grundmann, Christian
mailto:christian.grundm...@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
___
Users mailing list
Users@ovirt.org <mailto:Users@ovirt.org>
http://lists.ovirt.org/mailman/listinfo/users
smime.p7s
Description: S/MIME cryptographic signature
___
Users mailing list
Users@ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
Re: [ovirt-users] Reclaim disk space of thin disks
On Thu, Mar 31, 2016 at 1:05 PM, Grundmann, Christian <
christian.grundm...@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:yk...@redhat.com]
> *Gesendet:* Mittwoch, 30. März 2016 22:29
> *An:* Grundmann, Christian
> *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.grundm...@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
>
>
> ___
> Users mailing list
> Users@ovirt.org
> http://lists.ovirt.org/mailman/listinfo/users
>
>
>
___
Users mailing list
Users@ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
Re: [ovirt-users] Reclaim disk space of thin disks
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:yk...@redhat.com]
Gesendet: Mittwoch, 30. März 2016 22:29
An: Grundmann, Christian
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
mailto:christian.grundm...@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
___
Users mailing list
Users@ovirt.org <mailto:Users@ovirt.org>
http://lists.ovirt.org/mailman/listinfo/users
smime.p7s
Description: S/MIME cryptographic signature
___
Users mailing list
Users@ovirt.org
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Re: [ovirt-users] Reclaim disk space of thin disks
On Wed, Mar 30, 2016 at 10:04 AM, Grundmann, Christian <
christian.grundm...@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
>
> ___
> Users mailing list
> Users@ovirt.org
> http://lists.ovirt.org/mailman/listinfo/users
>
>
___
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[ovirt-users] Reclaim disk space of thin disks
Hi, is there a way to "shrink" a thin disk image to reclaim deleted space like using virt-sparsify? Or can it be done by making a snapshot and clone the VM to a new one? Thanks a lot Christian smime.p7s Description: S/MIME cryptographic signature ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
