Yes, this is expected behavior. You're telling the OSD to scrub every PG it holds, and it is doing so. The list of PGs to scrub is getting reset each time, but none of the individual scrubs are getting restarted. (I believe that if you instruct a PG to scrub while it's already doing so, nothing happens.) -Greg On Tue, Nov 11, 2014 at 9:54 PM Mallikarjun Biradar < mallikarjuna.bira...@gmail.com> wrote:
> Hi Greg, > > I am using 0.86 > > refering to osd logs to check scrub behaviour.. Please have look at log > snippet from osd log > > ##Triggered scrub on osd.10---> > 2014-11-12 16:24:21.393135 7f5026f31700 0 log_channel(default) log [INF] > : 0.4 scrub ok > 2014-11-12 16:24:24.393586 7f5026f31700 0 log_channel(default) log [INF] > : 0.20 scrub ok > 2014-11-12 16:24:30.393989 7f5026f31700 0 log_channel(default) log [INF] > : 0.21 scrub ok > 2014-11-12 16:24:33.394764 7f5026f31700 0 log_channel(default) log [INF] > : 0.23 scrub ok > 2014-11-12 16:24:34.395293 7f5026f31700 0 log_channel(default) log [INF] > : 0.36 scrub ok > 2014-11-12 16:24:35.941704 7f5026f31700 0 log_channel(default) log [INF] > : 1.1 scrub ok > 2014-11-12 16:24:39.533780 7f5026f31700 0 log_channel(default) log [INF] > : 1.d scrub ok > 2014-11-12 16:24:41.811185 7f5026f31700 0 log_channel(default) log [INF] > : 1.44 scrub ok > 2014-11-12 16:24:54.257384 7f5026f31700 0 log_channel(default) log [INF] > : 1.5b scrub ok > 2014-11-12 16:25:02.973101 7f5026f31700 0 log_channel(default) log [INF] > : 1.67 scrub ok > 2014-11-12 16:25:17.597546 7f5026f31700 0 log_channel(default) log [INF] > : 1.6b scrub ok > ##Previous scrub is still in progress, triggered scrub on osd.10 again--> > CEPH re-started scrub operation > 20104-11-12 16:25:19.394029 7f5026f31700 0 log_channel(default) log [INF] > : 0.4 scrub ok > 2014-11-12 16:25:22.402630 7f5026f31700 0 log_channel(default) log [INF] > : 0.20 scrub ok > 2014-11-12 16:25:24.695565 7f5026f31700 0 log_channel(default) log [INF] > : 0.21 scrub ok > 2014-11-12 16:25:25.408821 7f5026f31700 0 log_channel(default) log [INF] > : 0.23 scrub ok > 2014-11-12 16:25:29.467527 7f5026f31700 0 log_channel(default) log [INF] > : 0.36 scrub ok > 2014-11-12 16:25:32.558838 7f5026f31700 0 log_channel(default) log [INF] > : 1.1 scrub ok > 2014-11-12 16:25:35.763056 7f5026f31700 0 log_channel(default) log [INF] > : 1.d scrub ok > 2014-11-12 16:25:38.166853 7f5026f31700 0 log_channel(default) log [INF] > : 1.44 scrub ok > 2014-11-12 16:25:40.602758 7f5026f31700 0 log_channel(default) log [INF] > : 1.5b scrub ok > 2014-11-12 16:25:42.169788 7f5026f31700 0 log_channel(default) log [INF] > : 1.67 scrub ok > 2014-11-12 16:25:45.851419 7f5026f31700 0 log_channel(default) log [INF] > : 1.6b scrub ok > 2014-11-12 16:25:51.259453 7f5026f31700 0 log_channel(default) log [INF] > : 1.a8 scrub ok > 2014-11-12 16:25:53.012220 7f5026f31700 0 log_channel(default) log [INF] > : 1.a9 scrub ok > 2014-11-12 16:25:54.009265 7f5026f31700 0 log_channel(default) log [INF] > : 1.cb scrub ok > 2014-11-12 16:25:56.516569 7f5026f31700 0 log_channel(default) log [INF] > : 1.e2 scrub ok > > > -Thanks & regards, > Mallikarjun Biradar > > On Tue, Nov 11, 2014 at 12:18 PM, Gregory Farnum <g...@gregs42.com> wrote: > >> On Sun, Nov 9, 2014 at 9:29 PM, Mallikarjun Biradar >> <mallikarjuna.bira...@gmail.com> wrote: >> > Hi all, >> > >> > Triggering shallow scrub on OSD where scrub is already in progress, >> restarts >> > scrub from beginning on that OSD. >> > >> > >> > Steps: >> > Triggered shallow scrub on an OSD (Cluster is running heavy IO) >> > While scrub is in progress, triggered shallow scrub again on that OSD. >> > >> > Observed behavior, is scrub restarted from beginning on that OSD. >> > >> > Please let me know, whether its expected behaviour? >> >> What version of Ceph are you seeing this on? How are you identifying >> that scrub is restarting from the beginning? It sounds sort of >> familiar to me, but I thought this was fixed so it was a no-op if you >> issue another scrub. (That's not authoritative though; I might just be >> missing a reason we want to restart it.) >> -Greg >> > >
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