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>= 12.1.2
---------
* When running 'df' on a CephFS filesystem comprising exactly one data pool,
the result now reflects the file storage space used and available in that
data pool (fuse client only).
* Added new commands "pg force-recovery" and "pg-force-backfill". Use them
to boost recovery or backfill priority of specified pgs, so they're
recovered/backfilled before any other. Note that these commands don't
interrupt ongoing recovery/backfill, but merely queue specified pgs
before others so they're recovered/backfilled as soon as possible.
New commands "pg cancel-force-recovery" and "pg cancel-force-backfill"
restore default recovery/backfill priority of previously forced pgs.
12.2.1
------
* Clusters will need to upgrade to 12.2.1 before upgrading to any
Mimic 13.y.z version (either a development release or an eventual
stable Mimic release).
- *CephFS*:
* Limiting MDS cache via a memory limit is now supported using the new
mds_cache_memory_limit config option (1GB by default). A cache reservation
can also be specified using mds_cache_reservation as a percentage of the
limit (5% by default). Limits by inode count are still supported using
mds_cache_size. Setting mds_cache_size to 0 (the default) disables the
inode limit.
* The maximum number of PGs per OSD before the monitor issues a
warning has been reduced from 300 to 200 PGs. 200 is still twice
the generally recommended target of 100 PGs per OSD. This limit can
be adjusted via the ``mon_max_pg_per_osd`` option on the
monitors. The older ``mon_pg_warn_max_per_osd`` option has been removed.
* Creating pools or adjusting pg_num will now fail if the change would
make the number of PGs per OSD exceed the configured
``mon_max_pg_per_osd`` limit. The option can be adjusted if it
is really necessary to create a pool with more PGs.
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