Chapter 28. Get Pool Values
To get a value from a pool, execute the following:
ceph osd pool get <pool-name> <key>
You may get values for the following keys:
size
- Description
- Gets the number of replicas for objects in the pool. See Set the Number of Object Replicas_ for further details. Replicated pools only.
- Type
- Integer
min_size
- Description
- Gets the minimum number of replicas required for I/O. See Set the Number of Object Replicas_ for further details. Replicated pools only.
- Type
- Integer
- Version
-
0.54and above
crash_replay_interval
- Description
- The number of seconds to allow clients to replay acknowledged, but uncommitted requests.
- Type
- Integer
pgp_num
- Description
- The effective number of placement groups to use when calculating data placement.
- Type
- Integer
- Valid Range
-
Equal to or less than
pg_num.
crush_ruleset
- Description
- The ruleset to use for mapping object placement in the cluster.
- Type
- Integer
hit_set_type
- Description
- Enables hit set tracking for cache pools.
- Type
- String
- Valid Settings
-
bloom,explicit_hash,explicit_object
hit_set_count
- Description
-
The number of hit sets to store for cache pools. The higher the number, the more RAM consumed by the
ceph-osddaemon. - Type
- Integer
hit_set_period
- Description
-
The duration of a hit set period in seconds for cache pools. The higher the number, the more RAM consumed by the
ceph-osddaemon. - Type
- Integer
hit_set_fpp
- Description
-
The false positive probability for the
bloomhit set type. - Type
- Double
cache_target_dirty_ratio
- Description
- The percentage of the cache pool containing modified (dirty) objects before the cache tiering agent will flush them to the backing storage pool.
- Type
- Double
cache_target_full_ratio
- Description
- The percentage of the cache pool containing unmodified (clean) objects before the cache tiering agent will evict them from the cache pool.
- Type
- Double
target_max_bytes
- Description
-
Ceph will begin flushing or evicting objects when the
max_bytesthreshold is triggered. - Type
- Integer
target_max_objects
- Description
-
Ceph will begin flushing or evicting objects when the
max_objectsthreshold is triggered. - Type
- Integer
cache_min_flush_age
- Description
- The time (in seconds) before the cache tiering agent will flush an object from the cache pool to the storage pool.
- Type
- Integer
cache_min_evict_age
- Description
- The time (in seconds) before the cache tiering agent will evict an object from the cache pool.
- Type
- Integer
