CLI Guide

• As read cache. A virtual pool can contain only one read-cache disk group
A virtual pool cannot contain both a read-cache disk group and a Performance tier. At least one virtual disk
group must exist in a pool before a read-cache disk group can be added. A read-cache disk group can contain
a maximum of two disks.
When you add a virtual disk group, the system will first prepare the disk group to be added to a virtual pool.
During preparation, the disk group's status will be VPREP and the disk group cannot be removed. When
preparation is complete, the disk group will start initializing. During initialization, the disk group's status will be
INIT and the disk group will be available to store user data-or the disk group can be removed.
• All virtual disk groups in the same tier in a virtual pool should have the same RAID level, capacity, and
physical number of disks. This will provide consistent performance across the tier.
• To replace a single-disk read-cache disk group with a multiple-disk read-cache disk group, simply remove
the read cache and re-add it.
NOTE: If the only disk group in a virtual pool is quarantined, the pool will be inaccessible and
attempting to add a new disk group to that pool will fail with a "duplicate name" error. Before
you can add a disk group to that pool, you must resolve the problem with the quarantined disk
group.
Minimum role manage
Syntax
add disk-group
[adapt-spare-capacity size[B|KB|MB|GB|TB|KiB|MiB|GiB|TiB]|default]
[assigned-to a|b|auto]
[chunk-size 64k|128k|256k|512k]
disks disks
[level nraid|raid0|r0|raid1|r1|raid3|r3|raid5|r5|raid6|r6|raid10|r10|raid50|
r50|adapt]
[mode online|offline]
[pool a|b]
[spare disks]
type linear|virtual|read-cache
[name]
Parameters
adapt-spare-capacity size[B|KB|MB|GB|TB|KiB|MiB|GiB|TiB]|default
Optional. For an ADAPT disk group, this specifies the target spare capacity.
• size [B|KB|MB|GB|TB|KiB|MiB|GiB|TiB] : Sets the target spare capacity to a specific size. The
unit is optional (B represents bytes). If no unit is specified, GiB will be used, regardless of the currentbase.
Whichever unit is set, internally the value will be rounded down to the nearest GiB. If the value is set to 0,
the absolute minimum spare space will be used. If this parameter is omitted, the default setting will be
used.
• default: Sets the target spare capacity to the sum of the two largest disks in the disk group, which is
sufficient to fully recover fault tolerance after loss of any two disks in the group.
assigned-to a|b|auto
Optional for linear storage. Prohibited for virtual storage. For a system operating in Active-Active ULP mode,
this specifies the controller module to own the group. To let the system automatically load-balance groups
between controller modules, use auto or omit this parameter. In Single Controller mode, this parameter is
ignored; the system automatically load-balances groups in anticipation of the insertion of a second controller in
the future.
chunk-size 64k|128k|256k|512k
Optional for linear storage. Prohibited for virtual storage. Prohibited for ADAPT.
For linear storage, this specifies the amount of contiguous data, in KB, that is written to a disk-group member
before moving to the next member of the group. For NRAID and RAID 1, chunk-size has no meaning and is
therefore not applicable. For RAID 50, this option sets the chunk size of each RAID-5 subgroup. The chunk
30 Alphabetical list of commands