I need to move a 6+2 EC pool from HDDs to SSDs while storage must remain
accessible. All SSDs and HDDs are within the same failure domains. The crush
rule in question is
rule sr-rbd-data-one {
id 5
type erasure
min_size 3
max_size 8
step set_chooseleaf_tries 50
step set_choose_tries 1000
step take ServerRoom class hdd
step chooseleaf indep 0 type host
step emit
}
and I would be inclined just to change the entry "step take ServerRoom class
hdd" to "step take ServerRoom class ssd" and wait for the dust to settle.
However, this will almost certainly lead to all PGs being undersized and
inaccessible as all objects are in the wrong place. I noticed that this is not
an issue with PGs created by replicated rules as they can contain more OSDs
than the replication factor while objects are moved. The same does not apply to
EC rules. I suspect this is due to the setting "max_size 8", which does not
allow for more than 6+2=8 OSDs being a member of a PG.
What is the correct way to do what I need to do? Can I just set "max_size 16"
and go? Will this work with EC rules? If not, what are my options?
Thanks!
=================
Frank Schilder
AIT Risø Campus
Bygning 109, rum S14
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