Hi everyone,
I only have a single rule in my crushmap and only OSDs classed as hdd (after
the luminous update):
rule replicated_ruleset {
id 0
type replicated
min_size 1
max_size 10
step take default
step chooseleaf firstn 0 type host
step emit
}
Since luminous added device classes, I tried updating the rule to
step take default class hdd
so I could later add a rule for ssds without the existing pools trying to
balance on those.
Since all existing OSDs are classed as hdd I thought nothing should change with
this rule change (since the OSDs to be used are the same before and after the
change), however after inserting the new crushmap, the whole cluster started
rebalancing, after which I quickly reinserted the old crushmap.
So, is there any way to limit my existing pools to HDDs without causing a
complete rebalance (at least that's what it looked like)?
Best,
Patrick
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