By the way, here is a useful tool to calculate pg. http://ceph.com/pgcalc/
Best wishes, Mika 2015-11-18 11:46 GMT+08:00 Vickie ch <mika.leaf...@gmail.com>: > Hi wah peng, > Hope you don't mind. Just for reference. > A extreme case. If your ceph cluster have 3 osd disks on different osd > server. > Set pg number is 10240.(Just example) That's mean all these pg will > create on 3 disks. > Lost one OSD also means a lot of pg lost too. It may bring some trouble > for re-balance and recovery. > > In the other side, if you have 10000 OSDs but only set pg = 8. > That mean some disks have no chance to using. > > Best wishes, > Mika > > > 2015-11-13 16:26 GMT+08:00 wah peng <wah_p...@yahoo.com.sg>: > >> why data lost happens? thanks. >> >> On 2015/11/13 ζζδΊ 16:13, Vickie ch wrote: >> >>> In the other side, pg number too large but OSD number too small that >>> have a chance to cause data lost. >>> >> _______________________________________________ >> ceph-users mailing list >> ceph-users@lists.ceph.com >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> > >
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