> -----Original Message----- > From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of Ja. C.A. > Sent: 23 September 2016 10:38 > To: nick@xxxxxxxxxx; ceph-users@xxxxxxxxxxxxxx > Subject: Re: rbd pool:replica size choose: 2 vs 3 > > ummm....ok. > > and, how would the affected PG recover, just replacing the affected OSD/DISK? or would the affected PG migrate to othe OSD/DISK? Yes, Ceph would start recovering the PG's to other OSD's. But until your PG size=min_size then IO will be blocked. > > thx > > On 23/09/16 10:56, Nick Fisk wrote: > > > >> -----Original Message----- > >> From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of Ja. C.A. > >> Sent: 23 September 2016 09:50 > >> To: ceph-users@xxxxxxxxxxxxxx > >> Subject: Re: rbd pool:replica size choose: 2 vs 3 > >> > >> Hi > >> > >> with rep_size=2 and min_size=2, what drawbacks are removed compared > >> with > >> rep_size=2 and min_size=1? > > If you lose a disk, everything will stop working until the affected PG's are at size=2 again. > > > >> thx > >> J. > >> > >> On 23/09/16 10:07, Wido den Hollander wrote: > >>>> Op 23 september 2016 om 10:04 schreef mj <lists@xxxxxxxxxxxxx>: > >>>> > >>>> > >>>> Hi, > >>>> > >>>> On 09/23/2016 09:41 AM, Dan van der Ster wrote: > >>>>>> If you care about your data you run with size = 3 and min_size = 2. > >>>>>> > >>>>>> Wido > >>>> We're currently running with min_size 1. Can we simply change this, > >>>> online, with: > >>>> > >>>> ceph osd pool set vm-storage min_size 2 > >>>> > >>>> and expect everything to continue running? > >>>> > >>> Yes, it will. No rebalance will happen. min_size = 2 just tells Ceph > >>> that 2 replicas need to be online for I/O (Read and Write) > > to > >> continue. > >>> Wido > >>> > >>>> (our cluster is HEALTH_OK, enough disk space, etc, etc) > >>>> > >>>> MJ > >>>> _______________________________________________ > >>>> 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 > > _______________________________________________ > 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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