Reserving Disks

By default, the vxassist command allocates space from any disk that has free space. You can reserve a set of disks for special purposes, such as to avoid general use of a particularly slow or a particularly fast disk.

To reserve a disk for special purposes, use the following command:

# vxedit set reserve=on diskname

After you enter this command, the vxassist program does not allocate space from the selected disk unless that disk is specifically mentioned on the vxassist command line. For example, if disk03 is reserved, use the following command:

# vxassist make vol03 20m disk03

The vxassist command overrides the reservation and creates a 20 megabyte volume on disk03. However, the command:

# vxassist make vol04 20m

does not use disk03, even if there is no free space on any other disk.

To turn off reservation of a disk, use the following command:

# vxedit set reserve=off diskname

See Special Attribute Values for Disk Media in vxedit(1M) for more information.