Interesting....thx for that Henrik. BTW, my placements groups are arround 1800 objects (ceph pg dump) - meainng max of 7GB od data at the moment,
regular scrub just took 5-10sec to finish. Deep scrub would I guess take some minutes for sure What about deepscrub - timestamp is still some months ago, but regular scrub is fine now with fresh timestamp...? I don't see max deep scrub setings - or are these settings applied in general for both kind on scrubs ? Thanks On 13 March 2015 at 12:22, Henrik Korkuc <li...@kirneh.eu> wrote: > I think that there will be no big scrub, as there are limits of maximum > scrubs at a time. > http://ceph.com/docs/master/rados/configuration/osd-config-ref/#scrubbing > > If we take "osd max scrubs" which is 1 by default, then you will not get > more than 1 scrub per OSD. > > I couldn't quickly find if there are cluster wide limits. > > > On 3/13/15 10:46, Wido den Hollander wrote: > > > On 13-03-15 09:42, Andrija Panic wrote: > > Hi all, > > I have set nodeep-scrub and noscrub while I had small/slow hardware for > the cluster. > It has been off for a while now. > > Now we are upgraded with hardware/networking/SSDs and I would like to > activate - or unset these flags. > > Since I now have 3 servers with 12 OSDs each (SSD based Journals) - I > was wondering what is the best way to unset flags - meaning if I just > unset the flags, should I expect that the SCRUB will start all of the > sudden on all disks - or is there way to let the SCRUB do drives one by > one... > > > So, I *think* that unsetting these flags will trigger a big scrub, since > all PGs have a very old last_scrub_stamp and last_deepscrub_stamp > > You can verify this with: > > $ ceph pg <pgid> query > > A solution would be to scrub each PG manually first in a timely fashion. > > $ ceph pg scrub <pgid> > > That way you set the timestamps and slowly scrub each PG. > > When that's done, unset the flags. > > Wido > > > In other words - should I expect BIG performance impact or....not ? > > Any experience is very appreciated... > > Thanks, > > -- > > Andrija Panić > > > _______________________________________________ > ceph-users mailing > listceph-us...@lists.ceph.comhttp://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > _______________________________________________ > ceph-users mailing > listceph-us...@lists.ceph.comhttp://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 > > -- Andrija Panić
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