I'm seeing the same sort of issue.
Any suggestions on how to get Ceph to not start the ceph-osd processes
on host boot? It does not seem to be as simple as just disabling the
service
Regards
Nathan
On 15/07/2015 7:15 PM, Jan Schermer wrote:
We have the same problems, we need to start the OSDs slowly.
The problem seems to be CPU congestion. A booting OSD will use all available CPU power you give it, and if it doesn’t have enough nasty stuff happens (this might actually be the manifestation of some kind of problem in our setup as well).
It doesn’t do that always - I was restarting our hosts this weekend and most of them came up fine with simple “service ceph start”, some just sat there spinning the CPU and not doing any real world (and the cluster was not very happy about that).
Jan
On 15 Jul 2015, at 10:53, Kostis Fardelas <dante1234@xxxxxxxxx> wrote:
Hello,
after some trial and error we concluded that if we start the 6 stopped
OSD daemons with a delay of 1 minute, we do not experience slow
requests (threshold is set on 30 sec), althrough there are some ops
that last up to 10s which is already high enough. I assume that if we
spread the delay more, the slow requests will vanish. The possibility
of not having tuned our setup to the most finest detail is not zeroed
out but I wonder if at any way we miss some ceph tuning in terms of
ceph configuration.
We run firefly latest stable version.
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