chmdisk

Use the chmdisk command to modify the name or IBM® Easy Tier® settings for a managed disk (MDisk).

Syntax


>>- chmdisk -- --+-------------------------+-- ----------------->
                 '- -name -- new_name_arg -'      

>--+--------------------------------+--------------------------->
   '- -tier --+- tier0_flash -----+-'   
              +- tier1_flash -----+     
              +- tier_enterprise -+     
              '- tier_nearline ---'     

>--+--------------------------------+--------------------------->
   '- -easytierload --+-default---+-'   
                      +-low-------+     
                      +-medium----+     
                      +-high------+     
                      '-very_high-'     

>--+-----------------------+--+- mdisk_id ---+-----------------><
   '- -encrypt --+- yes -+-'  '- mdisk_name -'   
                 '- no --'

Parameters

-name new_name_arg

(Optional) Specifies the new name to be applied to the managed disk.

-tier tier0_flash | tier1_flash | tier_enterprise | tier_nearline

(Optional) Specifies the new tier of the MDisk. The values are:

tier0_flash: Specifies a tier0_flash hard disk drive or an external MDisk for the newly discovered or external volume.
tier1_flash: Specifies an tier1_flash (or flash drive) hard disk drive or an external MDisk for the newly discovered or external volume.
tier_enterprise: Specifies a tier_enterprise hard disk drive or an external MDisk for the newly discovered or external volume.
tier_nearline: Specifies a tier_nearline hard disk drive or an external MDisk for the newly discovered or external volume.

-easytierload default | low | medium | high | very_high

(Optional) Specifies the Easy Tier load (amount) to place on a non-array MDisk within its tier.

If Easy Tier is either overusing or under-utilizing a particular MDisk, modify the easy_tier_load value to change the load size.

Note: Specifying default returns the performance capability to the value used by the system. Specify very_high only if the MDisk tier is ssd.

-encrypt yes | no

(Optional) Specifies whether the MDisk is encrypted using its own encryption resources. The values are yes or no.

Important: If you use SAN Volume Controller in front of an encrypted Storwize® V7000 system, you should upgrade Storwize V7000 before applying encryption to your Storwize V7000 system.

If you apply encryption to your system, you must identify the encrypted MDisks before applying the encryption. If you specify chmdisk -encrypt, the setting is permanent in SAN Volume Controller no matter what Storwize V7000 says.

mdisk_id | mdisk_name

(Required) Specifies the ID or name of the managed disk to modify.

Description

This command modifies the attributes of a managed disk.

Do not use the -encrypt parameter if one of the MDisk group's has an encryption key, parent pool, and child pools. Use chmdisk for existing self-encrypting MDisks before starting any migration. If an MDisk is self-encrypting, the encrypted property defaults to what is reported.

An invocation example

chmdisk -tier tier0_flash mdisk13

The resulting output:

No feedback

An invocation example

chmdisk -tier tier_nearline mdisk0

The resulting output:

MDisk Group, id [13], successfully created

An invocation example

chmdisk -easytierload high mdisk0

The resulting output:

MDisk Group, id [13], successfully created

An invocation example

chmdisk -name my_first_mdisk -encrypt yes 0

The resulting output:

MDisk Group, id [0], successfully changed