Hi list,
Given a single node Ceph cluster (lab), I started out with the following
CRUSH rule:
> # rules
> rule replicated_ruleset {
> ruleset 0
> type replicated
> min_size 1
> max_size 10
> step take default
> step choose firstn 0 type osd
> step emit
> }
Meanwhile, the cluster has grown (production) and additional hosts (and
OSDs, obviously) were added.
Ensuring redundancy between hosts, I would like to alter the rule as
follows:
> # rules
> rule replicated_ruleset {
> ruleset 0
> type replicated
> min_size 1
> max_size 10
> step take default
> step chooseleaf firstn 0 type host
> step emit
> }
Is this the way to go? I would like as little performance degradation
while rebalancing as possible.
Please advice if I need to take in account certain preparations.
Thanks in advance!
Best regards,
Kees
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