On Mon, Jul 10, 2017 at 5:06 PM, Sage Weil <sage@xxxxxxxxxxxx> wrote: > On Mon, 10 Jul 2017, Luis Periquito wrote: >> Hi Dan, >> >> I've enabled it in a couple of big-ish clusters and had the same >> experience - a few seconds disruption caused by a peering process >> being triggered, like any other crushmap update does. Can't remember >> if it triggered data movement, but I have a feeling it did... > > That's consistent with what one should expect. > > The flag triggers a new peering interval, which means the PGs will peer, > but there is no change in the mapping or data layout or anything else. > The only thing that is potentially scary here is that *every* PG will > repeer at the same time. Thanks Sage & Luis. I confirm that setting sortbitwise on a large cluster is basically a non-event... nothing to worry about. (Btw, we just upgraded our biggest prod clusters to jewel -- that also went totally smooth!) -- Dan > sage > > >> >> >> >> On Mon, Jul 10, 2017 at 3:17 PM, Dan van der Ster <dan@xxxxxxxxxxxxxx> wrote: >> > Hi all, >> > >> > With 10.2.8, ceph will now warn if you didn't yet set sortbitwise. >> > >> > I just updated a test cluster, saw that warning, then did the necessary >> > ceph osd set sortbitwise >> > >> > I noticed a short re-peering which took around 10s on this small >> > cluster with very little data. >> > >> > Has anyone done this already on a large cluster with lots of objects? >> > It would be nice to hear that it isn't disruptive before running it on >> > our big production instances. >> > >> > Cheers, Dan >> > _______________________________________________ >> > 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
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