Hi,
I was just upgrading a 9 nodes, 36 OSD cluster running the next branch
from some days ago to the Cuttlefish release.
While rebooting the nodes one by one and waiting for a active+clean for
all PGs I noticed that some weird things happened.
I reboot a node and see:
"osdmap e580: 36 osds: 4 up, 36 in"
After a few seconds I see all the OSDs reporting:
osd.33 [WRN] map e582 wrongly marked me down
osd.5 [WRN] map e582 wrongly marked me down
osd.6 [WRN] map e582 wrongly marked me down
I didn't check what was happening here, but it seems like the 4 OSDs who
were shutting down reported everybody but themselves out (Should have
printed ceph osd tree).
Thinking about that, there is the following configuration option:
OPTION(osd_min_down_reporters, OPT_INT, 1)
OPTION(osd_min_down_reports, OPT_INT, 3)
So if just one OSD sends 3 reports it can mark anybody in the cluster
down, right?
Shouldn't the best practice be to set osd_min_down_reporters to at least
numosdperhost+1
In this case I have 4 OSDs per host, so shouldn't I use 5 here?
This might as well be a bug, but it still doesn't seem right that all
the OSDs on one machine can mark the whole cluster down.
--
Wido den Hollander
42on B.V.
Phone: +31 (0)20 700 9902
Skype: contact42on
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