Veritas Volume Manager 4.1 Administrator's Guide (HP-UX 11i v3, February 2007)

How VxVM Handles Storage Management
12 VERITAS Volume Manager Administrator’s Guide
“VM Disk Example” on page 12 shows a VM disk with a media name of disk01 that is
assigned to the physical disk devname.
VM Disk Example
Subdisks
A subdisk is a set of contiguous disk blocks. A block is a unit of space on the disk. VxVM
allocates disk space using subdisks. A VM disk can be divided into one or more subdisks.
Each subdisk represents a specific portion of a VM disk, which is mapped to a specific
region of a physical disk.
The default name for a VM disk is diskgroup## and the default name for a subdisk is
diskgroup##-##, where diskgroup is the name of the disk group to which the disk
belongs (see “Disk Groups” on page 11).
In the figure, “Subdisk Example” on page 12, disk01-01 is the name of the first subdisk
on the VM disk named disk01.
Subdisk Example
devname
VM Disk
Physical Disk
disk01
Subdisk
VM Disk with One Subdisk
disk01-01
disk01
disk01-01