CLI Guide

ADAPT will use whatever space is available. The new disks must also be in the same tier as the disk
group.
NOTE: If you upgraded from an earlier release that did not distinguish between enterprise and
midline SAS disks, you might have disk groups that contain both types of disks. For those groups,
you can designate either or both types of disks for expansion. If—through 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 119 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
80 Alphabetical list of commands