When you create pools and set the number of placement groups for the pool, Ceph
uses default values when you don't specifically override the defaults. **We
-recommend** overridding some of the defaults. Specifically, we recommend setting
+recommend** overriding some of the defaults. Specifically, we recommend setting
a pool's replica size and overriding the default number of placement groups. You
can specifically set these values when running `pool`_ commands. You can also
override the defaults by adding new ones in the ``[global]`` section of your
-Ceph configuration file.
+Ceph configuration file.
.. literalinclude:: pool-pg.conf
:Default: ``65536``
-``mon pg create interval``
+``mon pg create interval``
-:Description: Number of seconds between PG creation in the same
+:Description: Number of seconds between PG creation in the same
Ceph OSD Daemon.
:Type: Float
:Default: ``30.0``
-``mon pg stuck threshold``
+``mon pg stuck threshold``
-:Description: Number of seconds after which PGs can be considered as
+:Description: Number of seconds after which PGs can be considered as
being stuck.
:Type: 32-bit Integer
:Default: ``300``
+``mon pg min inactive``
-``osd pg bits``
+:Description: Issue a ``HEALTH_ERR`` in cluster log if the number of PGs stay
+ inactive longer than ``mon_pg_stuck_threshold`` exceeds this
+ setting. A non-positive number means disabled, never go into ERR.
+:Type: Integer
+:Default: ``1``
+
+
+``mon pg warn min per osd``
+
+:Description: Issue a ``HEALTH_WARN`` in cluster log if the average number
+ of PGs per (in) OSD is under this number. (a non-positive number
+ disables this)
+:Type: Integer
+:Default: ``30``
+
+
+``mon pg warn min objects``
+
+:Description: Do not warn if the total number of objects in cluster is below
+ this number
+:Type: Integer
+:Default: ``1000``
+
+
+``mon pg warn min pool objects``
+
+:Description: Do not warn on pools whose object number is below this number
+:Type: Integer
+:Default: ``1000``
+
+
+``mon pg check down all threshold``
+
+:Description: Threshold of down OSDs percentage after which we check all PGs
+ for stale ones.
+:Type: Float
+:Default: ``0.5``
+
+
+``mon pg warn max object skew``
+
+:Description: Issue a ``HEALTH_WARN`` in cluster log if the average object number
+ of a certain pool is greater than ``mon pg warn max object skew`` times
+ the average object number of the whole pool. (a non-positive number
+ disables this)
+:Type: Float
+:Default: ``10``
+
+
+``mon delta reset interval``
+
+:Description: Seconds of inactivity before we reset the pg delta to 0. We keep
+ track of the delta of the used space of each pool, so, for
+ example, it would be easier for us to understand the progress of
+ recovery or the performance of cache tier. But if there's no
+ activity reported for a certain pool, we just reset the history of
+ deltas of that pool.
+:Type: Integer
+:Default: ``10``
+
+
+``mon osd max op age``
+
+:Description: Maximum op age before we get concerned (make it a power of 2).
+ A ``HEALTH_WARN`` will be issued if a request has been blocked longer
+ than this limit.
+:Type: Float
+:Default: ``32.0``
+
+
+``osd pg bits``
:Description: Placement group bits per Ceph OSD Daemon.
:Type: 32-bit Integer
-:Default: ``6``
+:Default: ``6``
-``osd pgp bits``
+``osd pgp bits``
:Description: The number of bits per Ceph OSD Daemon for PGPs.
:Type: 32-bit Integer
``osd crush chooseleaf type``
-:Description: The bucket type to use for ``chooseleaf`` in a CRUSH rule. Uses
+:Description: The bucket type to use for ``chooseleaf`` in a CRUSH rule. Uses
ordinal rank rather than name.
:Type: 32-bit Integer
See `Weighting Bucket Items`_ for details.
-``osd pool default crush replicated ruleset``
+``osd pool default crush rule``
-:Description: The default CRUSH ruleset to use when creating a replicated pool.
+:Description: The default CRUSH rule to use when creating a replicated pool.
:Type: 8-bit Integer
-:Default: ``CEPH_DEFAULT_CRUSH_REPLICATED_RULESET``, which means "pick
- a ruleset with the lowest numerical ID and use that". This is to
- make pool creation work in the absence of ruleset 0.
+:Default: ``-1``, which means "pick the rule with the lowest numerical ID and
+ use that". This is to make pool creation work in the absence of rule 0.
``osd pool erasure code stripe unit``
``osd pool default min size``
-:Description: Sets the minimum number of written replicas for objects in the
- pool in order to acknowledge a write operation to the client.
- If minimum is not met, Ceph will not acknowledge the write to the
- client. This setting ensures a minimum number of replicas when
- operating in ``degraded`` mode.
+:Description: Sets the minimum number of written replicas for objects in the
+ pool in order to acknowledge a write operation to the client. If
+ minimum is not met, Ceph will not acknowledge the write to the
+ client, **which may result in data loss**. This setting ensures
+ a minimum number of replicas when operating in ``degraded`` mode.
:Type: 32-bit Integer
-:Default: ``0``, which means no particular minimum. If ``0``,
+:Default: ``0``, which means no particular minimum. If ``0``,
minimum is ``size - (size / 2)``.
-``osd pool default pg num``
+``osd pool default pg num``
-:Description: The default number of placement groups for a pool. The default
+:Description: The default number of placement groups for a pool. The default
value is the same as ``pg_num`` with ``mkpool``.
:Type: 32-bit Integer
-:Default: ``8``
+:Default: ``32``
-``osd pool default pgp num``
+``osd pool default pgp num``
-:Description: The default number of placement groups for placement for a pool.
- The default value is the same as ``pgp_num`` with ``mkpool``.
+:Description: The default number of placement groups for placement for a pool.
+ The default value is the same as ``pgp_num`` with ``mkpool``.
PG and PGP should be equal (for now).
:Type: 32-bit Integer
``osd pool default flags``
-:Description: The default flags for new pools.
+:Description: The default flags for new pools.
:Type: 32-bit Integer
:Default: ``0``
``osd max pgls``
-:Description: The maximum number of placement groups to list. A client
+:Description: The maximum number of placement groups to list. A client
requesting a large number can tie up the Ceph OSD Daemon.
:Type: Unsigned 64-bit Integer
:Note: Default should be fine.
-``osd min pg log entries``
+``osd min pg log entries``
-:Description: The minimum number of placement group logs to maintain
+:Description: The minimum number of placement group logs to maintain
when trimming log files.
:Type: 32-bit Int Unsigned
:Type: 32-bit Integer
:Default: ``45``
+``osd max pg per osd hard ratio``
+
+:Description: The ratio of number of PGs per OSD allowed by the cluster before
+ OSD refuses to create new PGs. OSD stops creating new PGs if the number
+ of PGs it serves exceeds
+ ``osd max pg per osd hard ratio`` \* ``mon max pg per osd``.
+
+:Type: Float
+:Default: ``2``
+
+``osd recovery priority``
+
+:Description: Priority of recovery in the work queue.
+
+:Type: Integer
+:Default: ``5``
+
+``osd recovery op priority``
+
+:Description: Default priority used for recovery operations if pool doesn't override.
+
+:Type: Integer
+:Default: ``3``
.. _pool: ../../operations/pools
.. _Monitoring OSDs and PGs: ../../operations/monitoring-osd-pg#peering
projects / ceph.git / blobdiff