Yes. This parameter is used in the condition described there:
http://docs.ceph.com/docs/jewel/rados/configuration/mon-osd-interaction/#osds-report-their-status
and works. I think the default timeout of 900s is quiet a bit large.
Also in the documentation is a other function wich checks the health of
OSDs and report them down:
http://docs.ceph.com/docs/jewel/rados/configuration/mon-osd-interaction/#osds-report-down-osds
As far as I see in the sourcode this documentation is not valid anymore!
I found this commit ->
https://github.com/ceph/ceph/commit/bcb8f362ec6ac47c4908118e7860dec7971d001f#diff-0a5db46a44ae9900e226289a810f10e8
"mon_osd_min_down_reporters" now is the threshold how many
"mon_osd_reporter_subtree_level" has to report a down OSD. in Hammer
this was how many other OSDs had to report. And in Hammer there was also
the parameter "mon_osd_min_down_reports" which sets how often a other
OSD has to report a other OSD. In Jewel the parameter doesn't exists
anymore.
With this "knowlege" I adjusted my configuration. And will now test it.
BTW:
While reading the source code I may found a other bug. Can you confirm this?
In the function "OSDMonitor::check_failure" in src/mon/OSDMonitor.cc
the code which counts the "reporters_by_subtree" is in the if block "if
(g_conf->mon_osd_adjust_heartbeat_grace) {". So if I disable
adjust_heartbeat_grace the reporters_by_subtree functionality will not
work at all.
Regards,
Manuel
Am 30.11.2016 um 15:24 schrieb John Petrini:
It's right there in your config.
mon osd report timeout = 900
See:
http://docs.ceph.com/docs/jewel/rados/configuration/mon-osd-interaction/
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On Wed, Nov 30, 2016 at 6:39 AM, Manuel Lausch <manuel.lau...@1und1.de
<mailto:manuel.lau...@1und1.de>> wrote:
Hi,
In a test with ceph jewel we tested how long the cluster needs to
detect and mark down OSDs after they are killed (with kill -9).
The result -> 900 seconds.
In Hammer this took about 20 - 30 seconds.
In the Logfile from the leader monitor are a lot of messeages like
2016-11-30 11:32:20.966567 7f158f5ab700 0 log_channel(cluster)
log [DBG] : osd.7 10.78.43.141:8120/106673
<http://10.78.43.141:8120/106673> reported failed by osd.272
10.78.43.145:8106/117053 <http://10.78.43.145:8106/117053>
A deeper look at this. A lot of OSDs reported this exactly one
time. In Hammer The OSDs reported a down OSD a few more times.
Finaly there is the following and the osd is marked down.
2016-11-30 11:36:22.633253 7f158fdac700 0 log_channel(cluster)
log [INF] : osd.7 marked down after no pg stats for 900.982893seconds
In my ceph.conf I have the following lines in the global section
mon osd min down reporters = 10
mon osd min down reports = 3
mon osd report timeout = 900
It seems the parameter "mon osd min down reports" is removed in
jewel but the documentation is not updated ->
http://docs.ceph.com/docs/jewel/rados/configuration/mon-osd-interaction/
<http://docs.ceph.com/docs/jewel/rados/configuration/mon-osd-interaction/>
Can someone tell me how ceph jewel detects down OSDs and mark them
down in a appropriated time?
The Cluster:
ceph version 10.2.3 (ecc23778eb545d8dd55e2e4735b53cc93f92e65b)
24 hosts á 60 OSDs -> 1440 OSDs
2 pool with replication factor 4
65536 PGs
5 Mons
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