Hello all
I have a 'would be nice' use case need I'm wondering if ceph can
handle. The goal is to allow an otherwise ordinary ceph server with a
little 'one-of' special purpose extra hardware that could provide at
least some value when off-host networking is down to do so while still
taking advantage of the locally ample ceph replication capability.
Then when connectivity is restored to participate as a 'normal' host in
the larger setup. Is this doable?
Here's a little more setup detail but tl;dr you get the idea.
Suppose a typical ceph multi-server, multi-osd/server setup. One
particular otherwise typical server that has osd's running on the bare
metal os and is also one of a few with a ceph mon and mds running in a
VM. But, that one server is 'special' in that it has some task-specific
hardware that a dedicated-purpose VM running on it uses, a task that has
no need to reference off-host data for any reason.
Like the other servers, there are several osds (1/drive) running on that
special server. So within that host there's plenty of room for
host-local replication, though the server be part of a multi-host setup.
Suppose owing to some mishap all the networking cables were disconnected
from that special server. Is there a ceph configuration allowing the
task-specific VM to operate based on a ceph block device relying only on
host-local osds -- without regard to off-host connectivity? Yet
providing normal host ceph participation when networking is normal?
I'd like to avoid adding some added non-ceph mirroring scheme for the
special-purpose VM's block device and I'd like to avoid having to
maintain yet another box for a small task.
Ideas appreciated!
Thanks
Harry Coin
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