Dell PowerVault ME4 Series Storage System CLI Guide

expand vdisk

Description

Adds disks to a linear disk group to expand its storage capacity.

The new disks must be the same type as disks already in the disk group. The disks need not have consistent capacity; ADAPT will use whatever space is available.

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, 3, 5, 6	Can add 1–4 disks at a time.	16
1	Cannot expand.	2
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 vdisk 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:Disk group expansion cannot be stopped and can take days to complete, depending on disk type, RAID level, and other factors.

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 vdisk

disks disks

[prompt yes|no]

vdisk

Parameters

disks disks

The IDs of the disks to add. For disk syntax, see Command syntax.

prompt yes|no

Optional. For scripting, this specifies an automatic reply to confirmation prompts:

yes: Allow the command to proceed.
no: Cancel the command

If this parameter is omitted, you must manually reply to prompts.

vdisk

The name or serial number of the linear disk group to expand. A name that includes a space must be enclosed in double quotes.

Examples

Expand linear disk group VD1 to include disk 1.11.

# expand vdisk disks 1.11 VD1

Expand a RAID-10 linear disk group named R10 to include an additional mirror pair.

# expand vdisk disks 2.9-10 R10

Expand a RAID-50 linear disk group named R50, which has four 3-disk subgroups, to include an additional subgroup.

# expand vdisk disks 2.1-2,2.5 R50

Add 10 disks to ADAPT disk group Data3.

# expand disk-group disks 1.1-10 Data3

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Dell PowerVault ME4 Series Storage System CLI Guide

expand vdisk

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