Hm....nice Thx guys
On 13 March 2015 at 12:33, Henrik Korkuc <lists@xxxxxxxxx> wrote:
I think settings apply to both kinds of scrubs
On 3/13/15 13:31, Andrija Panic wrote:
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 <lists@xxxxxxxxx> 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. WidoIn other words - should I expect BIG performance impact or....not ? Any experience is very appreciated... Thanks, -- Andrija Panić _______________________________________________ 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
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