Oh, this is basically working as intended. What happened is that the
mon died before the pending map was actually committed. The OSD has a
timeout (5s) after which it stops trying to mark itself down and just
dies (so that OSDs don't hang when killed). It took a bit longer than
5s for the remaining 2 mons to form a new quorum, so they never got
the MOSDMarkMeDown message so we had to do it the slow way. I would
prefer this behavior to changing the mon shutdown process or making
the OSDs wait longer, so I think that's it. If you want to avoid
disruption with colocated mons and osds, stop the osds first and then
reboot.
-Sam
On Thu, Jan 12, 2017 at 1:24 PM, Udo Lembke <ulembke@xxxxxxxxxxxx> wrote:
> Hi Sam,
>
> the webfrontend of an external ceph-dash was interrupted till the node
> was up again. The reboot took app. 5 min.
>
> But the ceph -w output shows some IO much faster. I will look tomorrow
> at the output again and create an ticket.
>
>
> Thanks
>
>
> Udo
>
>
> On 12.01.2017 20:02, Samuel Just wrote:
>> How long did it take for the cluster to recover?
>> -Sam
>>
>> On Thu, Jan 12, 2017 at 10:54 AM, Gregory Farnum <gfarnum@xxxxxxxxxx> wrote:
>>> On Thu, Jan 12, 2017 at 2:03 AM, <ulembke@xxxxxxxxxxxx> wrote:
>>>> Hi all,
>>>> I had just reboot all 3 nodes (one after one) of an small Proxmox-VE
>>>> ceph-cluster. All nodes are mons and have two OSDs.
>>>> During reboot of one node, ceph stucks longer than normaly and I look in the
>>>> "ceph -w" output to find the reason.
>>>>
>>>> This is not the reason, but I'm wonder why "osd marked itself down" will not
>>>> recognised by the mons:
>>>> 2017-01-12 10:18:13.584930 mon.0 [INF] osd.5 marked itself down
>>>> 2017-01-12 10:18:13.585169 mon.0 [INF] osd.4 marked itself down
>>>> 2017-01-12 10:18:22.809473 mon.2 [INF] mon.2 calling new monitor election
>>>> 2017-01-12 10:18:22.847548 mon.0 [INF] mon.0 calling new monitor election
>>>> 2017-01-12 10:18:27.879341 mon.0 [INF] mon.0@0 won leader election with
>>>> quorum 0,2
>>>> 2017-01-12 10:18:27.889797 mon.0 [INF] HEALTH_WARN; 1 mons down, quorum 0,2
>>>> 0,2
>>>> 2017-01-12 10:18:27.952672 mon.0 [INF] monmap e3: 3 mons at
>>>> {0=10.132.7.11:6789/0,1=10.132.7.12:6789/0,2=10.132.7.13:6789/0}
>>>> 2017-01-12 10:18:27.953410 mon.0 [INF] pgmap v4800799: 392 pgs: 392
>>>> active+clean; 567 GB data, 1697 GB used, 9445 GB / 11142 GB avail; 239 kB/s
>>>> wr, 15 op/s
>>>> 2017-01-12 10:18:27.953453 mon.0 [INF] fsmap e1:
>>>> 2017-01-12 10:18:27.953787 mon.0 [INF] osdmap e2053: 6 osds: 6 up, 6 in
>>>> 2017-01-12 10:18:29.013968 mon.0 [INF] pgmap v4800800: 392 pgs: 392
>>>> active+clean; 567 GB data, 1697 GB used, 9445 GB / 11142 GB avail; 73018 B/s
>>>> wr, 12 op/s
>>>> 2017-01-12 10:18:30.086787 mon.0 [INF] pgmap v4800801: 392 pgs: 392
>>>> active+clean; 567 GB data, 1697 GB used, 9445 GB / 11142 GB avail; 59 B/s
>>>> rd, 135 kB/s wr, 15 op/s
>>>> 2017-01-12 10:18:34.559509 mon.0 [INF] pgmap v4800802: 392 pgs: 392
>>>> active+clean; 567 GB data, 1697 GB used, 9445 GB / 11142 GB avail; 184 B/s
>>>> rd, 189 kB/s wr, 7 op/s
>>>> 2017-01-12 10:18:35.623838 mon.0 [INF] pgmap v4800803: 392 pgs: 392
>>>> active+clean; 567 GB data, 1697 GB used, 9445 GB / 11142 GB avail
>>>> 2017-01-12 10:18:39.580770 mon.0 [INF] pgmap v4800804: 392 pgs: 392
>>>> active+clean; 567 GB data, 1697 GB used, 9445 GB / 11142 GB avail
>>>> 2017-01-12 10:18:39.681058 mon.0 [INF] osd.4 10.132.7.12:6800/4064 failed (2
>>>> reporters from different host after 21.222945 >= grace 20.388836)
>>>> 2017-01-12 10:18:39.681221 mon.0 [INF] osd.5 10.132.7.12:6802/4163 failed (2
>>>> reporters from different host after 21.222970 >= grace 20.388836)
>>>> 2017-01-12 10:18:40.612401 mon.0 [INF] pgmap v4800805: 392 pgs: 392
>>>> active+clean; 567 GB data, 1697 GB used, 9445 GB / 11142 GB avail
>>>> 2017-01-12 10:18:40.670801 mon.0 [INF] osdmap e2054: 6 osds: 4 up, 6 in
>>>> 2017-01-12 10:18:40.689302 mon.0 [INF] pgmap v4800806: 392 pgs: 392
>>>> active+clean; 567 GB data, 1697 GB used, 9445 GB / 11142 GB avail
>>>> 2017-01-12 10:18:41.730006 mon.0 [INF] osdmap e2055: 6 osds: 4 up, 6 in
>>>>
>>>> Why trust the mon not the osd? In this case the osdmap will be right app. 26
>>>> seconds earlier (the pgmap at 10:18:27.953410 is wrong).
>>>>
>>>> ceph version 10.2.5 (c461ee19ecbc0c5c330aca20f7392c9a00730367)
>>> That's not what anybody intended to have happen. It's possible the
>>> simultaneous loss of a monitor and the OSDs is triggering a case
>>> that's not behaving correctly. Can you create a ticket at
>>> tracker.ceph.com with your logs and what steps you took and symptoms
>>> observed?
>>> -Greg
>>> _______________________________________________
>>> ceph-users mailing list
>>> ceph-users@xxxxxxxxxxxxxx
>>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>
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