CLI Guide

replacement of spares or failed disks—the disk group is changed to contain only one type of
disk, you will only be able to add disks of that type to the disk group.
NOTE: A disk group can contain a mix of 512-byte native sector size (512n) disks and 512-byte
emulated sector size (512e) disks. For consistent and predictable performance, do not mix
disks of different sector size types (512n, 512e).
The expansion capability for each supported RAID level is:
RAID level Expansion capability Maximum disks
NRAID Cannot expand. 1
0 Can add 1–4 disks at a time (linear storage). 16
0 Cannot expand (read cache, virtual storage). 2
0 Cannot expand (linear storage). 2
3 Can add 1–4 disks at a time (linear storage). 16
5 Can add 1–4 disks at a time. 16
6 Can add 1–4 disks at a time. 16
10 Can add 2 or 4 disks at a time (linear storage). 16
50
Can expand the disk group one RAID-5 subgroup at
a time. The added RAID-5 subgroup must contain
the same number of disks as each original subgroup
32
ADAPT Can add up to 68 disks at a time 128
When disks are added to an ADAPT disk group, the system will first replenish any spare capacity needed to
be fully fault-tolerant, then use the remainder or expansion of user data capacity.
• When set to the default spare capacity, the system will try to replenish spare capacity to be the sum of
the two largest disks in the group.
• When default spare capacity has been overridden (via the set disk-group on page 115 adapt-target-
spare-capacity parameter), the system will try to replenish spare capacity to meet the configured
target GiB.
• If the actual spare capacity meets the target spare capacity, the new disk capacity will be allocated to
user data.
NOTE:
Expansion of a non-ADAPT disk group can take hours or days to complete, depending
on the disk group’s RAID level and size, disk speed, utility priority, and other processes
running on the storage system. You can stop expansion only by deleting the disk group.
Expansion of an ADAPT disk group is very fast and extra capacity is immediately available when
rebalancing is not needed. If rebalancing is needed, extra capacity may not be available until
rebalancing is complete.
Before starting the expansion, ensure no other utilities are running on the disk group. If another operation is in
progress, the expansion cannot start.
Minimum role
manage
Syntax
expand disk-group
disks disks
[prompt yes|no]
disk-group
Parameters
disks disks
The IDs of the disks to add. For disk syntax, see Command syntax on page 17.
prompt yes|no
Optional. For scripting, this specifies an automatic reply to confirmation prompts:
78 Alphabetical list of commands