> On 26/03/2015, at 21.07, J-P Methot <[email protected]> wrote:
>
> That's a great idea. I know I can setup cinder (the openstack volume manager)
> as a multi-backend manager and migrate from one backend to the other, each
> backend linking to different pools of the same ceph cluster. What bugs me
> though is that I'm pretty sure the image store, glance, wouldn't let me do
> that. Additionally, since the compute component also has its own ceph pool,
> I'm pretty sure it won't let me migrate the data through openstack.
Hm wouldn’t it be possible to do something similar ala:
# list object from src pool
rados ls objects loop | filter-obj-id | while read obj; do
# export $obj to local disk
rados -p pool-wth-too-many-pgs get $obj
# import $obj from local disk to new pool
rados -p better-sized-pool put $obj
done
possible split/partition list of objects into multiple concurrent loops,
possible from multiple boxes as seems fit for resources at hand, cpu, memory,
network, ceph perf.
/Steffen
>
>
>
> On 3/26/2015 3:54 PM, Steffen W Sørensen wrote:
>>> On 26/03/2015, at 20.38, J-P Methot <[email protected]> wrote:
>>>
>>> Lately I've been going back to work on one of my first ceph setup and now I
>>> see that I have created way too many placement groups for the pools on that
>>> setup (about 10 000 too many). I believe this may impact performances
>>> negatively, as the performances on this ceph cluster are abysmal. Since it
>>> is not possible to reduce the number of PGs in a pool, I was thinking of
>>> creating new pools with a smaller number of PGs, moving the data from the
>>> old pools to the new pools and then deleting the old pools.
>>>
>>> I haven't seen any command to copy objects from one pool to another. Would
>>> that be possible? I'm using ceph for block storage with openstack, so
>>> surely there must be a way to move block devices from a pool to another,
>>> right?
>> What I did a one point was going one layer higher in my storage abstraction,
>> and created new Ceph pools and used those for new storage resources/pool in
>> my VM env. (ProxMox) on top of Ceph RBD and then did a live migration of
>> virtual disks there, assume you could do the same in OpenStack.
>>
>> My 0.02$
>>
>> /Steffen
>
>
> --
> ======================
> Jean-Philippe Méthot
> Administrateur système / System administrator
> GloboTech Communications
> Phone: 1-514-907-0050
> Toll Free: 1-(888)-GTCOMM1
> Fax: 1-(514)-907-0750
> [email protected]
> http://www.gtcomm.net
>
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