Hi,
I am experimenting with ceph (rbd only for now), and have a few
questions about what is possible via placement rules.
For example I am looking at a setup with a local datacenter
(datacenter0) and a remote one (datacenter1). I'm using a placement rule:
rule rbd {
ruleset 2
type replicated
min_size 1
max_size 10
step take datacenter0
step chooseleaf firstn -1 type host
step emit
step take datacenter1
step chooseleaf firstn 1 type host
step emit
}
and I have the rdb pool set to size 3.
So I *think* I am saying I want 2 replicas in datacenter0 and one in
datacenter1 [1].
The questions I have are:
1/ I would like to be able to have a way to say something like: Make 2
copies at datacenter0, 1 at datacenter1 - wait for the ones at
datacenter0 to be written but not the ones at datacenter1 (so
asynchronous for the latter). Is this possible, or planned?
2/ Also I would like to be able to say make my number of copies 3, but
if I lose datacenter0 (where 2 copies are), don't try to have 3 copies
at datacenter1 (so run degraded in that case). Is that possible?
Cheers
Mark
[1] Might make more sense to have 2 copies at each, but I'm just trying
to see how this placement business works at this point...
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