Dear all,
we are running a small cluster with about 80TB of storage which evolved
over time and increased in complexity and number of users. In the
beginning, we had started operating the cluster without any replicas
(pool size 1), but due to the size of the project we now wish to offer
redundancy in case of failures.
Can anyone offer insights into the procedure to increase the number of
replicas? So far from what I gather, I imagine it goes something likes this:
1. Make sure more than half of the disk space is free
2. ceph osd pool set {poolname} size 2 (if we want to have one replica),
and we do so for each pool (data and metadata)
Can somebody confirm that this is how it works? Is it as simple as
changing it for the existing filesystem as described above or do we need
to start from scratch? Is there anything we need to watch out for? Will
ceph then just start moving things around as needed, similar to the
normal rebalancing procedures?
Thank you for any insights,
Florian (a newbie admin trying to improve his ceph knowledge)
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