Dell PowerVault ME4 Series Storage System CLI Guide

create vdisk

Description

Creates a linear disk group using the specified RAID level, disks, and spares. This command applies to linear storage only.

All disks in the disk group must be the same type (enterprise SAS, for example).

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 rotational speed or sector size types (512n, 512e).

For each RAID level, the minimum and maximum numbers of disks supported are:


NRAID: 1 RAID 0: 2–16	RAID 1: 2 RAID 3: 3–16	RAID 5: 3–16 RAID 6: 4–16	RAID 10: 4–16 RAID 50: 6–32

For best practices for creating disk groups, see the Administrator’s Guide.

When you create a linear disk group, the system creates a linear pool with the same name. A linear pool can contain a single linear disk group.

Minimum role

manage

Syntax

create vdisk

[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

[mode online|offline] [spare disks]

name

Parameters

assigned-to a|b|auto

Optional. For a system operating in Active-Active ULP mode, this specifies the controller to own the disk group. To let the system automatically load-balance vdisks between controllers, use auto or omit this parameter. In Single Controller mode, this parameter is ignored; the system automatically load-balances vdisks in anticipation of the insertion of a second controller in the future

chunk-size 64k|128k|256k|512k

Optional. The amount of contiguous data, in KB, that is written to a disk group member before moving to the next member of the disk group. For RAID 50, this option sets the chunk size of each RAID-5 subgroup. The chunk size of the RAID-50 disk group is calculated as: configured-chunk-sizex (subgroup-members- 1). For NRAID and RAID 1, chunk-size has no meaning and is therefore not applicable. The default size is 512k.

disks disks

The IDs of the disks to include in the disk group. RAID 10 requires a minimum of two RAID-1 subgroups each having two disks. RAID 50 requires a minimum of two RAID-5 subgroups each having three disks. For disk syntax, see Command syntax.

mode online|offline

Optional. Specifies whether the disk group is initialized online or offline.

online: Enables you to use the disk group immediately after creating it while it is initializing. Because online uses the verify method to create the disk group, it takes longer to complete initializing than offline. Online initialization is fault-tolerant. This option is the default.
offline: You must wait for the disk group initialization process to finish before using the disk group. However, offline takes less time to complete initializing than online

spare disks

Optional. The IDs of 1–4 dedicated spares to assign to a RAID 1, 3, 5, 6, 10, or 50 disk group. For disk syntax, see Command syntax.

name

A name for the new disk group. Input rules:

The value is case sensitive.
The value can have a maximum of 32 bytes.
The value can include spaces and printable UTF-8 characters except: " , . < \
A value that includes a space must be enclosed in double quotes.

Examples

Create a RAID-1 linear disk group named VD1 using two disks.

# create vdisk level raid1 disks 0.1,0.3 VD1

Create a RAID-50 linear disk group named VD2 having three RAID-5 subgroups, each having three disks.

# create vdisk level r50 disks 0.1-3:0.4-6:0.7-9 VD2

Create a RAID-6 linear disk group named vdR6 using four disks.

# create vdisk level r6 disks 2.3-4,2.8-9 vdR6

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Dell PowerVault ME4 Series Storage System CLI Guide

create vdisk

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