Hi Jean You would probably need this
ceph osd pool create glance-images-bkp 128 128 rados cppool glance-images glance-images-bkp ceph osd pool rename glance-images glance-images-old ceph osd pool rename glance-images-bkp glance-images ceph osd pool delete glance-images-old glance-images-old --yes-i-really-really-mean-it ( once you are sure data is moved 100% ) I would suggest to stop openstack services that are using the original pool , then copy the data , rename pools , finally start openstack services and check everything is there. I have done this once with success. **************************************************************** Karan Singh Systems Specialist , Storage Platforms CSC - IT Center for Science, Keilaranta 14, P. O. Box 405, FIN-02101 Espoo, Finland mobile: +358 503 812758 tel. +358 9 4572001 fax +358 9 4572302 http://www.csc.fi/ **************************************************************** > On 27 Mar 2015, at 00:01, Gregory Farnum <g...@gregs42.com> wrote: > > On Thu, Mar 26, 2015 at 2:53 PM, Steffen W Sørensen <ste...@me.com> wrote: >> >>> On 26/03/2015, at 21.07, J-P Methot <jpmet...@gtcomm.net> 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 $obj >> done > > You would also have issues with snapshots if you do this on an RBD > pool. That's unfortunately not feasible. > -Greg > > >> >> possible split/partition list of objects into multiple concurrent loops, >> possible from multiple boxes as seems fit for resources at hand, cpu, >> memory, network, ceph perf. >> >> /Steffen >> >>> >>> >>> >>> On 3/26/2015 3:54 PM, Steffen W Sørensen wrote: >>>>> On 26/03/2015, at 20.38, J-P Methot <jpmet...@gtcomm.net> wrote: >>>>> >>>>> Lately I've been going back to work on one of my first ceph setup and now >>>>> I see that I have created way too many placement groups for the pools on >>>>> that setup (about 10 000 too many). I believe this may impact >>>>> performances negatively, as the performances on this ceph cluster are >>>>> abysmal. Since it is not possible to reduce the number of PGs in a pool, >>>>> I was thinking of creating new pools with a smaller number of PGs, moving >>>>> the data from the old pools to the new pools and then deleting the old >>>>> pools. >>>>> >>>>> I haven't seen any command to copy objects from one pool to another. >>>>> Would that be possible? I'm using ceph for block storage with openstack, >>>>> so surely there must be a way to move block devices from a pool to >>>>> another, right? >>>> What I did a one point was going one layer higher in my storage >>>> abstraction, and created new Ceph pools and used those for new storage >>>> resources/pool in my VM env. (ProxMox) on top of Ceph RBD and then did a >>>> live migration of virtual disks there, assume you could do the same in >>>> OpenStack. >>>> >>>> My 0.02$ >>>> >>>> /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 >>> jpmet...@gtcomm.net >>> http://www.gtcomm.net >>> >> >> _______________________________________________ >> ceph-users mailing list >> ceph-users@lists.ceph.com >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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