Dear Ceph Experts,
after upgrading our Ceph cluster from Hammer to Jewel,
the MDS (after a few days) found some metadata damage:
# ceph status
[...]
health HEALTH_ERR
mds0: Metadata damage detected
[...]
The output of
# ceph tell mds.0 damage ls
is:
[
{
"ino" : [...],
"id" : [...],
"damage_type" : "backtrace"
},
[...]
]
There are 5 such "damage_type" : "backtrace" entries in total.
I'm not really surprised, there were a very few instances in
the past where one or two (mostly empty directories) and
symlinks acted strangely, and couldn't be deleted
("rm results in "Invalid argument"). Back then, I moved them
all in a "quarantine" directory, but wasn't able to do anything
about it.
Now that CephFS does more rigorous checks and has spotted
the trouble - how do I go about repairing this?
Cheers and thanks for any help,
Oliver
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