Hi Sage,
We recently meet a network partition problem, cause our ceph
cluster can not service rbd service.
We are running 0.67.5 on our customer cluster. And the network
partition is 3 osd can connect mon, but can not connect with all other
osds.
Then many PGs fall in peering status, and rbd I/O is hang.
Before we operate the cluster , I set nout flag and stop the 3
OSDs. After operating the 3 OSDs memory and OS bootup, the network is
partition. The 3 OSDs start, then many PGs went to peering.
I stoped the 3 OSDs process, but the PGs fall in peering.
After network partition is fixed, all PG get active+clean, all is OK.
I can't explain this, because I think the OSD can judge if the
other OSD is alive, and I can see 3OSD is marked down in 'ceph osd
tree'.
Why did these PGs fall in peering?
Thanks!
Ketor
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