Hi Joachim,
I'm currently looking for the general methodology and if it's possible without rebalancing everything.
But of course I'd also appreciate tips directly for my deployment; here is the info:
Ceph 18, Simple 3-replication (osd_pool_default_size = 3, default CRUSH rules Ceph creates for that).
Failure domains from `ceph osd tree`:
root default
region FSN
zone FSN1
datacenter FSN1-DC1
host machine-1
osd.0
... 10 OSDs per datacenter
... currently 1 machine per datacenter
datacenter FSN1-DC2
host machine-2
...
... currently 8 datacenters
I already tried simply
ceph osd crush move machine-1 datacenter=FSN1-DC2
to "simulate" that DC1 and DC2 are temporarily the same failure domain (machine-1 is the only machine in DC1 currently), but that immediately causes 33% of objects to be misplaced -- much more movement than I'd hope for and more than would be needed (I'd expect 12.5% would need to be moved given that 1 out of 8 DCs needs to be moved).
Thanks!
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