Chapter 7. Setting placement group auto-scaling modes

• off: Disables auto-scaling for the pool. It is up to the administrator to choose an appropriate PG number for each pool. Refer to the Placement group count section for more information.
• on: Enables automated adjustments of the PG count for the given pool.
• warn: Raises health alerts when the PG count needs adjustment.

Procedure

• Enable auto-scaling on an existing pool:

  Syntax

  ceph osd pool set POOL_NAME pg_autoscale_mode on

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  Example

  [ceph: root@host01 /]# ceph osd pool set testpool pg_autoscale_mode on

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• Enable auto-scaling on a newly created pool:

  Syntax

  ceph config set global osd_pool_default_pg_autoscale_mode MODE

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  Example

  [ceph: root@host01 /]# ceph config set global osd_pool_default_pg_autoscale_mode on

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• Create a pool with the bulk flag:

  Syntax

  ceph osd pool create POOL_NAME --bulk

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  Example

  [ceph: root@host01 /]#  ceph osd pool create testpool --bulk

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• Set or unset the bulk flag for an existing pool:

  Important

  The values must be written as true, false, 1, or 0. 1 is equivalent to true and 0 is equivalent to false. If written with different capitalization, or with other content, an error is emitted.

  The following is an example of the command written with the wrong syntax:

  [ceph: root@host01 /]# ceph osd pool set ec_pool_overwrite bulk True
  Error EINVAL: expecting value 'true', 'false', '0', or '1'

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  Syntax

  ceph osd pool set POOL_NAME bulk true/false/1/0

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  Example

  [ceph: root@host01 /]#  ceph osd pool set testpool bulk true

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• Get the bulk flag of an existing pool:

  Syntax

  ceph osd pool get POOL_NAME bulk

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  Example

  [ceph: root@host01 /]# ceph osd pool get testpool bulk
  bulk: true

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