On Thu, Jul 3, 2014 at 11:17 AM, Iban Cabrillo <cabri...@ifca.unican.es> wrote: > Hi Gregory, > Thanks a lot I begin to understand who ceph works. > I add a couple of osd servers, and balance the disk between them. > > > [ceph@cephadm ceph-cloud]$ sudo ceph osd tree > # id weight type name up/down reweight > -7 16.2 root 4x1GbFCnlSAS > -9 5.4 host node02 > 7 2.7 osd.7 up 1 > 8 2.7 osd.8 up 1 > -4 5.4 host node03 > > 2 2.7 osd.2 up 1 > 9 2.7 osd.9 up 1 > -3 5.4 host node04 > > 1 2.7 osd.1 up 1 > 10 2.7 osd.10 up 1 > -6 16.2 root 4x4GbFCnlSAS > > -5 5.4 host node01 > 3 2.7 osd.3 up 1 > 4 2.7 osd.4 up 1 > -8 5.4 host node02 > 5 2.7 osd.5 up 1 > 6 2.7 osd.6 up 1 > -2 5.4 host node04 > > 0 2.7 osd.0 up 1 > 11 2.7 osd.11 up 1 > -1 32.4 root default > -2 5.4 host node04 > > 0 2.7 osd.0 up 1 > 11 2.7 osd.11 up 1 > -3 5.4 host node04 > > 1 2.7 osd.1 up 1 > 10 2.7 osd.10 up 1 > -4 5.4 host node03 > > 2 2.7 osd.2 up 1 > 9 2.7 osd.9 up 1 > -5 5.4 host node01 > 3 2.7 osd.3 up 1 > 4 2.7 osd.4 up 1 > -8 5.4 host node02 > 5 2.7 osd.5 up 1 > 6 2.7 osd.6 up 1 > -9 5.4 host node02 > 7 2.7 osd.7 up 1 > 8 2.7 osd.8 up 1 > > The Idea Is to have at least 4 servers and 3 disk (2.7 TB SAN attached) for > server per pool. > Now i have to adjust the pg and pgp and make some performance test. > > PD which is the difference betwwwn chose ans choseleaf?
"choose" instructs the system to choose N different buckets of the given type (where N is specified by the "firstn 0" block to be the replication level, but could be 1: "firstn 1", or replication - 1: "firstn -1"). Since you're saying "choose firstn 0 type host", that's what you're getting out, and then you're emitting those 3 (by default) hosts. But they aren't valid "devices" (OSDs), so it's not a valid mapping; you're supposed to then say "choose firstn 1 device" or similar. "chooseleaf" instead tells the system to choose N different buckets, and then descend from each of those buckets to a leaf ("device") in the CRUSH hierarchy. It's a little more robust against different mappings and failure conditions, so generally a better choice than "choose" if you don't need the finer granularity provided by choose. -Greg Software Engineer #42 @ http://inktank.com | http://ceph.com _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com