rbd-mirror orchestration

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Hey, I'm about to add rbd-mirror support to teh ssh orch and have a few 
questions after skimming doc/rbd/rbd-mirroring.rst

The orchestrator thinks of service in terms of sets.  Rook, for example, 
can scale the number of daemons up and down.  I assume I want one set of 
daemons per peer cluster?  Does the rbd-mirror daemon then service any 
rbd-mirroring-enabled pool that works with taht peer cluster?  Or is there 
anything I can/should do to tell a particular rbd-mirror daemon to work on 
one pool or peer vs another?

FWIW on the RGW side, the 'group' is a zone, and we're making the client 
ids hierarchical, like client.rgw.$zone.$id.  And the config subsystem has 
been updated so that we pull optoins from global, client, client.rgw, 
client.rgw.$zone, and client.rgw.$zone.$id.  In the rgw case, we 'config 
set client.rgw.$zone rgw_zone $zone', which ensures all those daemons are 
working on the right thing.  We might be able/want to do something similar 
here?

Thanks!
sage
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