VERITAS Storage Foundation 4.1 Oracle Administrator's Guide

Chapter 2, Setting Up Databases
Prerelease 8 September 2005, 8:54am Creating a Disk Group for a Database
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Creating a Disk Group for a Database
You can use the vxdg command or the graphical user interface (GUI) to create a new disk group. A
disk group must contain at least one disk at the time it is created. You also have the option to create
a shared disk group for use in a cluster environment.
Disks must be placed in disk groups before they can be used by VxVM. You can create disk groups
to organize your disks into logical sets of disks.
When you place a disk under VxVM control, the disk is initialized. Initialization destroys any
existing data on the disk.
Prerequisites
◆ Only disks that are online and do not belong to a disk group can be used to create a disk group.
◆ The disk group name must be unique in the host or cluster.
◆ Creating a disk group requires at least one disk.
Usage Notes
◆ For information on the vxdg command, see the vxdg(1M) manual page.
◆ In the GUI, if multiple disks are specified in the Disk Device(s) field and only one disk name is
specified in the Disk Name(s) field, VxVM appends numbers to the disk name so that each
disk name is unique within its disk group.
◆ New disks must be placed under VxVM control and then added to a dynamic disk group before
they can be used for volumes. The Actions > Rescan command performs these tasks to
prepare new disks for VxVM use.
◆ When you place a disk under VxVM control, the disk is initialized. Initialization destroys any
existing data on the disk.
◆ Disks are automatically assigned a default name. Once a disk is under VxVM control, you can
select Actions > Rename Disk in the GUI to change the disk name.
Usage Notes
◆ 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 another disk group can be used to create a disk
group.
▼ To create a new disk group using the command line
Use the vxdg command as follows: