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Chapter 27. Set Pool Values


To set a value to a pool, execute the following:

ceph osd pool set <pool-name> <key> <value>
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You may set values for the following keys:

size

Description
Sets 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
Sets 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
0.54 and 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

hashpspool

Description
Set/Unset HASHPSPOOL flag on a given pool.
Type
Integer
Valid Range
1 sets flag, 0 unsets flag
Version
Version 0.48 Argonaut and above.

hit_set_type

Description
Enables hit set tracking for cache pools.
Type
String
Valid Settings
bloom, explicit_hash, explicit_object
Default
bloom. Other values are for testing.

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-osd daemon.
Type
Integer
Valid Range
1. Agent doesn’t handle > 1 yet.

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-osd daemon.
Type
Integer
Example
3600 1hr

hit_set_fpp

Description
The false positive probability for the bloom hit set type.
Type
Double
Valid Range
0.0 - 1.0
Default
0.05

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
Default
.4

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
Default
.8

target_max_bytes

Description
Ceph will begin flushing or evicting objects when the max_bytes threshold is triggered.
Type
Integer
Example
1000000000000 #1-TB

target_max_objects

Description
Ceph will begin flushing or evicting objects when the max_objects threshold is triggered.
Type
Integer
Example
1000000 #1M objects

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
Example
600 10min

cache_min_evict_age

Description
The time (in seconds) before the cache tiering agent will evict an object from the cache pool.
Type
Integer
Example
1800 30min
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