On 4/23/14 12:33 , Dyweni - Ceph-Users wrote:
Hi,
I'd like to know what happens to a cluster with one monitor while that
one monitor process is being restarted.
For example, if I have an RBD image mounted and in use (actively
reading/writing) when I restart that monitor, will all those reading
and writing operations block until the monitor has finished restarting
and is operational again?
I haven't tested RDB, but I did test RGW. RGW continued working fine
for the ~10 minutes I had the monitors down. I didn't try to restart
anything else though. I believe that if I attempted to restart radosgw
while the monitors are down, it would block until the monitors are up.
With absolutely no idea what I'm talking about, I would guess that your
already mounted RBD would continue to work, and any new mounts would block.
I assume that very bad things would happen if I lost a node or disk
while the monitors were down. I have no plans to test this.
The monitor processes aren't very heavy though. Is there any reason you
can't run more than one?
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