How full is the cluster before adding the third node? If it's over 65% I would recommend adding 2 new nodes instead of 1. The reason for that is that it if you lose one of the nodes, your cluster will try to backfill back onto the 2 nodes and be way too full. There is no rule or recommendation about having a multiple number of servers to match your replicas. 3 servers is fine for a replica of 2.
On Wed, May 31, 2017 at 11:42 AM Kevin Olbrich <k...@sv01.de> wrote: > Hi! > > A customer is running a small two node ceph cluster with 14 disks each. > He has min_size 1 and size 2 and it is only used for backups. > > If we add a third member with 14 identical disks and remain size = 2, > replicas should be distributed evenly, right? > Or is an uneven count of hosts unadvisable or not working? > > Kind regards, > Kevin > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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