Use the chmdisk command
to modify the name or 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 } ] [ -encrypt { yes | no } ] { mdisk_id | mdisk_name }
Parameters
- -namenew_name_arg
- (Optional) Specifies the new name to be applied to the managed
disk.
- -tiertier0_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.
- -easytierloaddefault |
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.
- -encryptyes | 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