Dell PowerVault MD3420 - Manual (Page 46)

The command in this example creates the same virtual disk as the previous create virtualDisk
command. However, in this case the user does not know which physical disks are assigned to this disk
group.
Creating Virtual Disks In An Existing Disk Group
To add a new virtual disk to an existing disk group, use the following command:
create virtualDisk DiskGroup=diskGroupNumber
userLabel="virtualDiskName" [freeCapacityArea=
freeCapacityIndexNumber | capacity=
virtualDiskCapacity | owner=(0 | 1) | segmentSize=
segmentSizeValue]
NOTE: The freeCapacityArea, capacity, owner, and segmentSize parameters are optional.
You can use one or all optional parameters as needed to help define your configuration, though you
do not need to use any of them.
The diskGroup parameter is the number of the disk group in which you want to create a new virtual
disk. If you do not know the disk group numbers on the storage array, you can use the show
allVirtualDisks summary command. This command displays a list of the virtual disks and the disk
groups to which the virtual disks belong.
The userLabel parameter is the name you want to give to the virtual disk. The virtual disk name can be
any combination of alphanumeric characters, hyphens, and underscores. The maximum length of the
virtual disk name is 30 characters. You must enclose the virtual disk name with quotation marks (" ").
The freeCapacityArea parameter defines the free capacity area to use for the virtual disk. If a disk
group has several free capacity areas, you can use this parameter to identify which free capacity area to
use for virtual disk creation. You do not have to assign the entire capacity of the physical disks to the
virtual disk. Assign any unused space to another virtual disk at another time.
The userLabel, capacity, owner, and segmentSize parameters are the same as in the previous
versions of the create virtualDisk command.
Enclosure Loss Protection
The enclosureLossProtect parameter is a boolean switch that turns enclosure loss protection on or
off. To work properly, each physical disk in a virtual disk group must be in a separate enclosure. Enclosure
loss protection is set under the following conditions:
• You assign the physical disks.
• The RAID controller module assigns the physical disks.
The following table shows possible results for the enclosureLossProtect parameter. The results
depend on whether you assign the physical disks or the RAID controller module assigns the physical
disks.
Method enclosureLossProtect= TRUE enclosureLossProtect=FALSE
You assign the physical disks. If you select more than one
physical disk from any one
enclosure, the storage array
returns an error. The storage array performs the
operation, but the created disk
group does not have enclosure
loss protection.
The RAID controller module
firmware assigns the physical
disks. The storage array posts an error if
the RAID controller module
firmware cannot provide physical
disks to ensure that the new disk The storage array performs the
operation even if it means that
the disk group might not have
enclosure loss protection.
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