mon service failed to start

[Behnam Loghmani <behnam.loghmani@xxxxxxxxx>]

Hi there,

I have a Ceph cluster version 12.2.2 on CentOS 7.

It is a testing cluster and I have set it up 2 weeks ago.

after some days, I see that one of the three mons has stopped(out of quorum) and I can't start it anymore.

I checked the mon service log and the output shows this error:

"""
mon.XXXXXX@-1(probing) e4 preinit clean up potentially inconsistent store state
rocksdb: submit_transaction_sync error: Corruption: block checksum mismatch
code = 2 Rocksdb transaction:
     0> 2018-02-16 17:37:07.041812 7f45a1e52e40 -1 /home/jenkins-build/build/workspace/ceph-build/ARCH/x86_64/AVAILABLE_ARCH/x86_64/AVAILABLE_DIST/centos7/DIST/centos7/MACHINE_SIZE/huge/release/12.2.2/rpm/el7/BUI
LD/ceph-12.2.2/src/mon/MonitorDBStore.h: In function 'void MonitorDBStore::clear(std::set<std::basic_string<char> >&)' thread 7f45a1e52e40 time 2018-02-16 17:37:07.040846
/home/jenkins-build/build/workspace/ceph-build/ARCH/x86_64/AVAILABLE_ARCH/x86_64/AVAILABLE_DIST/centos7/DIST/centos7/MACHINE_SIZE/huge/release/12.2.2/rpm/el7/BUILD/ceph-12.2.2/src/mon/MonitorDBStore.h: 581: FAILE
D assert(r >= 0)
"""

the only solution I found is to remove this mon from quorum and remove all mon data and re-add this mon to quorum again.

and ceph goes to the healthy status again.

but now after some days this mon has stopped and I face the same problem again.

My cluster setup is:

4 osd hosts

total 8 osds

3 mons

1 rgw

this cluster has setup with ceph-volume lvm and wal/db separation on logical volumes.

Best regards,

Behnam Loghmani

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