Hi David,
I have had a few weird issues when shutting down a node, although I can replicate it by doing a “stop ceph-all” as well. It seems that OSD failure detection takes a lot longer when a monitor goes down at the same time, sometimes I have seen the whole cluster grind to a halt for several minutes before it works out whats happened.
If I stop the either role and wait for it to be detected as failed and then do the next role, I don’t see the problem. So it might be something to keep in mind when doing maintenance.
Nick
From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of David Graham
Sent: 10 February 2015 17:07
To: ceph-users@xxxxxxxx
Subject: [ceph-users] combined ceph roles
Hello, I'm giving thought to a minimal footprint scenario with full redundancy. I realize it isn't ideal--and may impact overall performance -- but wondering if the below example would work, supported, or known to cause issue?
Example, 3x hosts each running:
-- OSD's
-- Mon
-- ClientI thought I read a post a while back about Client+OSD on the same host possibly being an issue -- but i am having difficulty finding that reference.
I would appreciate if anyone has insight into such a setup,
thanks!
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