Use the chmdiskgrp command to modify
the name that is assigned to a storage pool or to set the warning
threshold for the storage pool.
Syntax
chmdiskgrp [ -name new_name_arg ] [ -size new_size ] [ -warning { disk_size_percentage% } disk_size [ -unit { b | kb | mb | gb | tb | pb } ] ] [ -easytier { auto | on | off | measure } ] { mdisk_group_name | mdisk_group_id }
Parameters
- -namenew_name_arg
- (Optional) Specifies the new name of the storage pool.
- -warningdisk_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%,
which is a percentage of the storage pool size. To disable warnings,
specify 0 or 0%.
- -sizenew_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.
- -unitb | kb | mb | gb |
tb | pb
- (Optional) Specifies the data units for the -warning parameter.
- -easytierauto | on | off | measure
- (Optional) Specifies if 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, Lenovo Storage V series system 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 measureEasy 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.
- mdisk_group_id | mdisk_group_name
- (Required) Specifies the ID or name of the storage pool to modify.
Description
Table 1. Parameter differences for child pools and parent pools| Parameter |
Child pool usage |
Storage pool usage |
|---|
| -name |
Optional |
Optional |
| -easytier |
Cannot be used with child pools |
Optional |
| -size |
Optional |
Cannot be used with parent pools |
| -unit |
Optional |
Optional |
| -warning |
Optional |
Optional |
This command modifies the name, or label, assigned to a
given storage pool. You can use the new name to refer to the storage
pool.
The command can also be used to set the warning threshold for the storage pool. The warning
threshold is the threshold which a warning is generated when it is exceeded by the used-disk
capacity in the storage pool.
You can also use this command
to change other settings for parent pools and child pools.
An invocation example
chmdiskgrp -name testmdiskgrp -easytier on Group0
The
resulting output:
No feedback
An
invocation example
chmdiskgrp -size 100 -unit tb mypool
The
resulting output:
No feedback