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 [ -namenew_name_arg ] [ -sizenew_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_percentage%, 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 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, Lenovo Storage V series 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:
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An invocation
example
chmdiskgrp -size 100 -unit tb mypool
The resulting
output:
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