Alter Tier

Alters properties of an existing tier to facilitate resource management.

To disable watermark-based eviction, set both high_watermark and low_watermark to 100.

Input Parameter Description

NameTypeDescription
namestringName of the tier to be altered. Must be an existing tier group name: vram, ram, disk[n], persist, cold[n].
optionsmap of string to strings

Optional parameters. The default value is an empty map ( {} ).

Supported Parameters (keys)Parameter Description
capacityMaximum size in bytes this tier may hold at once, per rank.
high_watermarkThreshold of usage of this tier's resource that once exceeded, will trigger watermark-based eviction from this tier. The minimum allowed value is 0. The maximum allowed value is 100.
low_watermarkThreshold of resource usage that once fallen below after crossing the high_watermark, will cease watermark-based eviction from this tier. The minimum allowed value is 0. The maximum allowed value is 100.
wait_timeoutTimeout in seconds for reading from or writing to this resource. Applies to cold storage tiers only.
persist

If true the system configuration will be written to disk upon successful application of this request. This will commit the changes from this request and any additional in-memory modifications. The default value is true. The supported values are:

  • true
  • false
rankApply the requested change only to a specific rank. The minimum allowed value is 0. The maximum allowed value is 10000.

Output Parameter Description

NameTypeDescription
namestringValue of input parameter name.
infomap of string to stringsAdditional information.