On Mon, Jan 5, 2015 at 12:11 PM, Robert LeBlanc wrote:
> If Ceph snapshots work like VM snapshots (and I don't have any reason to
> believe otherwise), the snapshot will never grow larger than the size of the
> base image. If the same blocks are rewritten, then they are just rewritten
> in the sna
If Ceph snapshots work like VM snapshots (and I don't have any reason to
believe otherwise), the snapshot will never grow larger than the size of
the base image. If the same blocks are rewritten, then they are just
rewritten in the snapshot and don't take any extra space. The snapshot
functions dif
On Tue, 16 Dec 2014 11:50:37 AM Robert LeBlanc wrote:
> COW into the snapshot (like VMware, Ceph, etc):
> When a write is committed, the changes are committed to a diff file and the
> base file is left untouched. This only has a single write penalty, if you
> want to discard the child, it is fast a
On 17 December 2014 at 11:50, Robert LeBlanc wrote:
>
>
> On Tue, Dec 16, 2014 at 5:37 PM, Lindsay Mathieson
> wrote:
>>
>> On 17 December 2014 at 04:50, Robert LeBlanc wrote:
>> > There are really only two ways to do snapshots that I know of and they
>> > have
>> > trade-offs:
>> >
>> > COW int
On Tue, Dec 16, 2014 at 5:37 PM, Lindsay Mathieson <
lindsay.mathie...@gmail.com> wrote:
>
> On 17 December 2014 at 04:50, Robert LeBlanc wrote:
> > There are really only two ways to do snapshots that I know of and they
> have
> > trade-offs:
> >
> > COW into the snapshot (like VMware, Ceph, etc):
On 17 December 2014 at 04:50, Robert LeBlanc wrote:
> There are really only two ways to do snapshots that I know of and they have
> trade-offs:
>
> COW into the snapshot (like VMware, Ceph, etc):
>
> When a write is committed, the changes are committed to a diff file and the
> base file is left un
t;
> À: "Wido den Hollander"
> Cc: "ceph-users"
> Envoyé: Mardi 16 Décembre 2014 17:02:12
> Objet: Re: [ceph-users] rbd snapshot slow restore
>
>
>
>
>
>
>
> Alexandre Derumier
> Ingénieur système et stockage
>
>
> Fixe : 03 20 68
uch snapshot with distributed
storage)
- Mail original -
De: "aderumier"
À: "Wido den Hollander"
Cc: "ceph-users"
Envoyé: Mardi 16 Décembre 2014 17:02:12
Objet: Re: [ceph-users] rbd snapshot slow restore
Alexandre Derumier
Ingénieur système et
ander"
À: "ceph-users"
Envoyé: Mardi 16 Décembre 2014 16:18:09
Objet: Re: [ceph-users] rbd snapshot slow restore
On 12/16/2014 04:14 PM, Carl-Johan Schenström wrote:
> On 2014-12-16 14:53, Lindsay Mathieson wrote:
>
>>> Is this normal? is ceph just really slow
On 12/16/2014 04:14 PM, Carl-Johan Schenström wrote:
> On 2014-12-16 14:53, Lindsay Mathieson wrote:
>
>>> Is this normal? is ceph just really slow at restoring rbd snapshots,
>>> or have I really borked my setup?
>>
>> I'm not looking for a fix or a tuning suggestions, just feedback on
>> whether
On 2014-12-16 14:53, Lindsay Mathieson wrote:
Is this normal? is ceph just really slow at restoring rbd snapshots,
or have I really borked my setup?
I'm not looking for a fix or a tuning suggestions, just feedback on whether
this is normal
That is my experience as well. I rolled back a 1,5 T
On Tue, 16 Dec 2014 11:26:35 AM you wrote:
> Is this normal? is ceph just really slow at restoring rbd snapshots,
> or have I really borked my setup?
I'm not looking for a fix or a tuning suggestions, just feedback on whether
this is normal
--
Lindsay
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I'm finding snapshot restores to be very slow. With a small vm, I can
take a snapshot withing seconds, but restores can take over 15
minutes, sometimes nearly an hou, depending on how I have tweaked
ceph.
The same vm as a QCOW2 image on NFS or native disk can be restored in
under 30 seconds.
Is t
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