> > For an OSD, look for leveldb/rocksdb messages in the log.
>
> And what if nothing is in these logs?
I think you can race over all content in the OSD dir, which incurs
lots more IO but also works:

cd /var/lib/ceph/osd/ceph-123

# grep -rsil leveldb current/meta
current/meta/osd\usuperblock__0_23C2FCDE__none

or

# grep -rsil leveldb current/omap/
current/omap/MANIFEST-1524661

-- 
May the most significant bit of your life be positive.
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