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 <ko@xxxxxxx> 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
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