Filter
Top Products
29Understanding Veritas Volume Manager
How VxVM handles storage management
Figure 1-6 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 28).
In Figure 1-7, disk01-01 is the name of the first subdisk on the VM disk named
disk01.
Figure 1-7 Subdisk example
A VM disk can contain multiple subdisks, but subdisks cannot overlap or share
the same portions of a VM disk. Figure 1-8 shows a VM disk with three subdisks.
(The VM disk is assigned to one physical disk.)
devname
VM disk
Physical disk
disk01
Subdisk
VM disk with one subdisk
disk01-01
disk01
disk01-01