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271 lines
7.6 KiB
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271 lines
7.6 KiB
ReStructuredText
======================================
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Pool, PG and CRUSH Config Reference
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======================================
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.. index:: pools; configuration
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When you create pools and set the number of placement groups for the pool, Ceph
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uses default values when you don't specifically override the defaults. **We
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recommend** overridding some of the defaults. Specifically, we recommend setting
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a pool's replica size and overriding the default number of placement groups. You
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can specifically set these values when running `pool`_ commands. You can also
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override the defaults by adding new ones in the ``[global]`` section of your
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Ceph configuration file.
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.. literalinclude:: pool-pg.conf
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:language: ini
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``mon max pool pg num``
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:Description: The maximum number of placement groups per pool.
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:Type: Integer
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:Default: ``65536``
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``mon pg create interval``
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:Description: Number of seconds between PG creation in the same
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Ceph OSD Daemon.
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:Type: Float
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:Default: ``30.0``
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``mon pg stuck threshold``
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:Description: Number of seconds after which PGs can be considered as
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being stuck.
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:Type: 32-bit Integer
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:Default: ``300``
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``mon pg min inactive``
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:Description: Issue a ``HEALTH_ERR`` in cluster log if the number of PGs stay
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inactive longer than ``mon_pg_stuck_threshold`` exceeds this
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setting. A non-positive number means disabled, never go into ERR.
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:Type: Integer
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:Default: ``1``
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``mon pg warn min per osd``
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:Description: Issue a ``HEALTH_WARN`` in cluster log if the average number
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of PGs per (in) OSD is under this number. (a non-positive number
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disables this)
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:Type: Integer
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:Default: ``30``
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``mon pg warn max per osd``
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:Description: Issue a ``HEALTH_WARN`` in cluster log if the average number
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of PGs per (in) OSD is above this number. (a non-positive number
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disables this)
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:Type: Integer
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:Default: ``300``
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``mon pg warn min objects``
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:Description: Do not warn if the total number of objects in cluster is below
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this number
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:Type: Integer
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:Default: ``1000``
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``mon pg warn min pool objects``
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:Description: Do not warn on pools whose object number is below this number
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:Type: Integer
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:Default: ``1000``
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``mon pg check down all threshold``
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:Description: Threshold of down OSDs percentage after which we check all PGs
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for stale ones.
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:Type: Float
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:Default: ``0.5``
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``mon pg warn max object skew``
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:Description: Issue a ``HEALTH_WARN`` in cluster log if the average object number
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of a certain pool is greater than ``mon pg warn max object skew`` times
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the average object number of the whole pool. (a non-positive number
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disables this)
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:Type: Float
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:Default: ``10``
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``mon delta reset interval``
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:Description: Seconds of inactivity before we reset the pg delta to 0. We keep
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track of the delta of the used space of each pool, so, for
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example, it would be easier for us to understand the progress of
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recovery or the performance of cache tier. But if there's no
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activity reported for a certain pool, we just reset the history of
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deltas of that pool.
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:Type: Integer
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:Default: ``10``
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``mon osd max op age``
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:Description: Maximum op age before we get concerned (make it a power of 2).
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A ``HEALTH_WARN`` will be issued if a request has been blocked longer
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than this limit.
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:Type: Float
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:Default: ``32.0``
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``osd pg bits``
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:Description: Placement group bits per Ceph OSD Daemon.
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:Type: 32-bit Integer
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:Default: ``6``
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``osd pgp bits``
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:Description: The number of bits per Ceph OSD Daemon for PGPs.
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:Type: 32-bit Integer
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:Default: ``6``
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``osd crush chooseleaf type``
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:Description: The bucket type to use for ``chooseleaf`` in a CRUSH rule. Uses
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ordinal rank rather than name.
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:Type: 32-bit Integer
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:Default: ``1``. Typically a host containing one or more Ceph OSD Daemons.
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``osd crush initial weight``
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:Description: The initial crush weight for newly added osds into crushmap.
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:Type: Double
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:Default: ``the size of newly added osd in TB``. By default, the initial crush
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weight for the newly added osd is set to its volume size in TB.
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See `Weighting Bucket Items`_ for details.
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``osd pool default crush replicated ruleset``
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:Description: The default CRUSH ruleset to use when creating a replicated pool.
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:Type: 8-bit Integer
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:Default: ``CEPH_DEFAULT_CRUSH_REPLICATED_RULESET``, which means "pick
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a ruleset with the lowest numerical ID and use that". This is to
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make pool creation work in the absence of ruleset 0.
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``osd pool erasure code stripe unit``
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:Description: Sets the default size, in bytes, of a chunk of an object
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stripe for erasure coded pools. Every object of size S
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will be stored as N stripes, with each data chunk
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receiving ``stripe unit`` bytes. Each stripe of ``N *
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stripe unit`` bytes will be encoded/decoded
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individually. This option can is overridden by the
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``stripe_unit`` setting in an erasure code profile.
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:Type: Unsigned 32-bit Integer
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:Default: ``4096``
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``osd pool default size``
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:Description: Sets the number of replicas for objects in the pool. The default
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value is the same as
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``ceph osd pool set {pool-name} size {size}``.
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:Type: 32-bit Integer
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:Default: ``3``
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``osd pool default min size``
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:Description: Sets the minimum number of written replicas for objects in the
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pool in order to acknowledge a write operation to the client. If
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minimum is not met, Ceph will not acknowledge the write to the
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client, **which may result in data loss**. This setting ensures
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a minimum number of replicas when operating in ``degraded`` mode.
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:Type: 32-bit Integer
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:Default: ``0``, which means no particular minimum. If ``0``,
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minimum is ``size - (size / 2)``.
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``osd pool default pg num``
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:Description: The default number of placement groups for a pool. The default
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value is the same as ``pg_num`` with ``mkpool``.
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:Type: 32-bit Integer
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:Default: ``8``
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``osd pool default pgp num``
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:Description: The default number of placement groups for placement for a pool.
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The default value is the same as ``pgp_num`` with ``mkpool``.
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PG and PGP should be equal (for now).
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:Type: 32-bit Integer
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:Default: ``8``
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``osd pool default flags``
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:Description: The default flags for new pools.
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:Type: 32-bit Integer
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:Default: ``0``
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``osd max pgls``
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:Description: The maximum number of placement groups to list. A client
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requesting a large number can tie up the Ceph OSD Daemon.
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:Type: Unsigned 64-bit Integer
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:Default: ``1024``
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:Note: Default should be fine.
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``osd min pg log entries``
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:Description: The minimum number of placement group logs to maintain
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when trimming log files.
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:Type: 32-bit Int Unsigned
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:Default: ``1000``
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``osd default data pool replay window``
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:Description: The time (in seconds) for an OSD to wait for a client to replay
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a request.
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:Type: 32-bit Integer
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:Default: ``45``
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``osd max pg per osd hard ratio``
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:Description: The ratio of number of PGs per OSD allowed by the cluster before
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OSD refuses to create new PGs. OSD stops creating new PGs if the number
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of PGs it serves exceeds
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``osd max pg per osd hard ratio`` \* ``mon max pg per osd``.
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:Type: Float
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:Default: ``2``
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.. _pool: ../../operations/pools
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.. _Monitoring OSDs and PGs: ../../operations/monitoring-osd-pg#peering
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.. _Weighting Bucket Items: ../../operations/crush-map#weightingbucketitems
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