So I had two ideas here:
1. Use find as Jan suggested. You probably can bound it by the expected object naming and limit it to the OSDs that were impacted. This is probably the best way.
2. Use the osdmaptool against a copy of the osdmap that you pre-grab from the cluster, ala: https://www.hastexo.com/resources/hints-and-kinks/which-osd-stores-specific-rados-object
--David
On Fri, Sep 25, 2015 at 10:11 AM, Jan Schermer <jan@xxxxxxxxxxx> wrote:
Ouch
1) I should have read it completely
2) I should have tested it :)
Sorry about that...
You could get the name prefix for each RBD from rbd info, then list all objects (run find on the osds?) and then you just need to grep the OSDs for each prefix... Should be much faster?
Jan
> On 25 Sep 2015, at 15:07, Межов Игорь Александрович <megov@xxxxxxxxxx> wrote:
>
> Hi!
>
> Last week I wrote, that one PG in our Firefly stuck in degraded state with 2 replicas instead of 3
> and do not try to backfill or recovery. We try to investigate, what RBD vol's are affected.
>
> The working plan are inspired by Sebastian Han's snippet
> (http://www.sebastien-han.fr/blog/2013/11/19/ceph-rbd-objects-placement/)
> and consists of next steps:
>
> 1. rbd -p <pool> ls - to list all RBD volumes on the pool
> 2. Get RBD prefix, corresponding the volume
> 3. Get a list of objects, which belongs to our RBD volume
> 4. Issue 'ceph osd map <pool> <objectname>' to get PG for object and OSD placement
>
> After writing some scripts we face a difficulty: running 'ceph osd map...' and getting object
> placement takes about 0.5 second, so iterating all 15 millions objects will take forever.
>
> Is there any other way to find to what PGs the specified RBD volume are mapped,
> or may be there is a much faster way to do our step 4 instead of calling 'ceph osd map'
> in loop for every object.
>
>
> Thanks!
>
> Megov Igor
> CIO, Yuterra
> _______________________________________________
> ceph-users mailing list
> ceph-users@xxxxxxxxxxxxxx
> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
_______________________________________________
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
_______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
