Ceph status shows HEALTH_ERR with MDSs report damaged metadata

Issue

When checking Ceph Status ( ceph -s ), cluster health is listed as HEALTH_ERR, with the following line listed:

1 MDSs report damaged metadata

Check of the output of the damage ls command shows similar to the following:

# ceph tell mds.$filesystem:0 damage ls
[
    {
        "damage_type": "backtrace",
        "id": 2091078454,
        "ino": 1,
        "path": ""
    }
]

Where: $filesystem is the name of the CephFS filesystem which has the damaged metadata. This is not the hostname of the MDS.

vvv ATTENTION vvv

Before applying this fix...

Please confirm that:

• the "damage_type" is listed as "backtrace".
• the "ino" value is 1, which indicates that the damaged metadata corresponds to the root of the filesystem.

^^^ ATTENTION ^^^