Hi, On 07/07/17 13:03, David Turner wrote: > So many of your questions depends on what your cluster is used for. We > don't even know rbd or cephfs from what you said and that still isn't > enough to fully answer your questions. I have a much smaller 3 node > cluster using Erasure coding for rbds as well as cephfs and it is fine > speed-wise for my needs with the cache tier on the hdds. Luminous will > remove the need for a cache tier to use Erasure coding if you can wait. Sorry; our cluster is used partly to provide volumes for OpenStack, and party for S3 (via rgw). > Is your current cluster fast enough for your needs? Is Erasure coding > just for additional space? If so, moving to Erasure coding requires you > to copy your data from the replicated pool to the EC pool land you will > have 2 copies of your data until you feel confident enough to delete the > replicated copy. Elaborate on what you mean when you ask how robust EC > is, you then referred to replicated as simple. Are you concerned it > will add complexity or that it will be lacking features of a replicated > pool? I think our cluster is currently fast enough (I'm sure our users would always want more speed :) ); we were thinking that erasure coding would save us some disk space, yes. I'm concerned that erasure coded pools (and a cache tier in front of them) will be a more complex setup to manage (we use ceph-ansible) than our current setup (replicated pools). Thanks, Matthew -- The Wellcome Trust Sanger Institute is operated by Genome Research Limited, a charity registered in England with number 1021457 and a company registered in England with number 2742969, whose registered office is 215 Euston Road, London, NW1 2BE. _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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