Creating a Disk Group

You may want to create additional Oracle Automatic Storage Management (Oracle ASM) disk groups to do any of the following:

Have disk groups with different redundancy levels (normal, high, or external), depending on availability requirements and storage system capabilities.
Separate different classes of storage (for example, SCSI drives and Serial Advanced Technology Attachment (SATA) drives) into different disk groups. Disks in a disk group should have similar size and performance characteristics.
Store the fast recovery area in a separate disk group from the database.

To create a disk group:

Go to the Oracle ASM Home page.

See "Accessing the Oracle Automatic Storage Management Home Page".
Click the Disk Groups link to display the Disk Groups subpage.
If the Oracle ASM Login page appears, then log in as the SYS user, connecting as SYSASM. Provide the SYS password that was set when the Oracle ASM instance was created.
Click Create.

The Create Disk Group page appears. It displays a list of Oracle ASM disks that are available to be added to a disk group. You can use the Select Member Disks drop-down list to choose whether All Disks or Only Candidate disks are displayed.

Description of the illustration create_disk_group_11gr2.gif
Enter the disk group name, and select redundancy type (high, normal, or external).
Select disks as follows:
1. Select the check box to the left of each disk to include in the new disk group.
2. To force the inclusion of a disk in the disk group, select the Force Reuse check box for that disk.
  
  Caution: The Force Reuse check box causes the disk to be added to the new disk group even if the disk belongs to another disk group and has valid database data. This data will be lost. You must be certain that you are selecting a disk that can legitimately be added to the disk group.
3. Optionally enter an Oracle ASM disk name for each selected disk. (Oracle ASM provides a name if you do not.)
Click OK to create the disk group.

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