chmdiskgrp

Parameters

-name new_name_arg

(Optional) Specifies the new name of the storage pool.

-warning disk_size | disk_size_percentage %

(Optional) Sets a threshold at which a warning is generated. The warning is generated the first time that the threshold is exceeded by the used-disk capacity in the storage pool. You can specify a disk_size integer, which defaults to megabytes (MB) unless the -unit parameter is specified; or you can specify a disk_size_percentage %, which is a percentage of the storage pool size. To disable warnings, specify 0 or 0%.

-size new_size

(Optional) Specifies the new size of a child pool.

Note: This parameter cannot be used with parent pools. Use addmdisk or rmmdisk to change storage pool capacity.

-unit b | kb | mb | gb | tb | pb

(Optional) Specifies the data units for the -warning parameter.

-vdiskprotectionenabled yes | no

(Optional) Specifies whether volume protection in enabled for this storage pool.

-easytier auto | on | off | measure

(Optional) Specifies whether the Easy Tier® function is on or off for this storage pool, or if it is automatically determined. -easytier is active in storage pools with multiple tiers and is balance with single tiers.

Note: -easytier must be followed by one of the following:

• If -easytier is set to auto, Storwize® V7000 automatically enables Easy Tier functions when the storage pool contains MDisks from more than one tier, and enables automatic rebalancing when the storage pool contains MDisks from only one tier.
• If -easytier is set to on, then Easy Tier functions are active.
• If -easytier is set to off, then Easy Tier functions are inactive.
• If -easytier is set to measure Easy Tier statistics are collected but Easy Tier management is disabled. (No extents are moved by Easy Tier.)

auto equates to:

• on if Easy Tier is licensed or no license is required.
• off if Easy Tier is not licensed and a license is required.

Specifying -easytier on enables Easy Tier:

• Management of both single-tier and multi-tier pools
• Auto rebalance

Extents are moved to balance the I/O load on the MDisks in the pool.

-ownershipgroup owner_id | owner_name

(Optional) The name or ID of the ownership group to which the object is being added. This parameter can be specified on child pools only.

-noownershipgroup

(Optional) If specified, the object is removed from the ownership group to which it belongs. This parameter can be specified on child pools only.

mdisk_group_id | mdisk_group_name

(Required) Specifies the ID or name of the storage pool to modify.

-etfcmoverallocationmax percentage | off

(Optional) Sets the maximum over allocation which Easy Tier can migrate onto FlashCore Module arrays, when the array is used as the top tier in a multitier pool. The value acts as a multiplier of the physically available space. The allowed values are a percentage in the range of 100% (default) to 400% or off. Setting the value to off disables this feature.