Creating a Shared Disk Group

This procedure creates a shared disk group for use in a cluster environment. Disks must be placed in disk groups before they can be used by the Volume Manager. The default disk group (rootdg) is usually created during Volume Manager installation and always exists on a system running the Volume Manager. You can create additional disk groups to organize your disks into logical sets of disks.

When you place a disk under Volume Manager control, the disk is initialized. Initialization destroys any existing data on the disk.

To create a disk group

Select the host machine that is the master node.
Choose File > New > Disk Group (menu) or Disk Group Create (Command Launcher).

Complete the New Disk Group dialog box as follows:

Disk Group Name:	Type the name of the disk group to be created. Click View to view the names of existing disk groups. To set up any new disks on the system, click Scan Disks. This runs the disk setup commands appropriate for the operating system.
Disk Device(s):	Select the disk(s) to be placed in the new disk group.
Cluster Settings	Click Show Options to access the optional settings for this task. Select Create Shared to create a shared disk group.
Options	Click Show Options to access the optional settings for this task. To specify the Volume Manager disk name for the disk, type a disk name in the Disk Name(s) field. If no Volume Manager disk name is specified, the Volume Manager assigns a default name to the disk. To apply a comment or attribute to disks that are placed in the disk group, type the information in the Comment field.

When you have provided all necessary information in the dialog box, click OK.

Notes:

This task requires a disk group name and the name of at least one disk.
The disk group name must be unique.
The new disk group must contain at least one disk.
Only disks that are online and do not belong to a disk group can be used to create a disk group.
The Volume Manager disk name must be unique within the disk group.
If multiple disks are specified in the Disk Device(s) field and only one disk name is specified in Disk Name(s) field, the Volume Manager appends numbers to the disk name so that each disk name is unique within its disk group.

Creating a Shared Disk Group

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To create a disk group