VERITAS Volume Manager 4.1 Administrator's Guide

Understanding VERITAS Volume Manager
Volume Layouts in VxVM
Chapter 120
The figure, “Example of Concatenation,”, shows concatenation with one
subdisk.
Figure 1-12 Example of Concatenation
You can use concatenation with multiple subdisks when there is
insufficient contiguous space for the plex on any one disk. This form of
concatenation can be used for load balancing between disks, and for head
movement optimization on a particular disk. See the figure, “Example of
a Volume in a Concatenated Configuration,”
Figure 1-13 Example of a Volume in a Concatenated Configuration
The figure, “Example of Spanning,” on page 21 shows data spread over
two subdisks in a spanned plex. In the figure, “Example of Spanning,”
the first six blocks of data (B1 through B6) use most of the space on the
disk to which VM disk disk01 is assigned. This requires space only on
VM Disk
Physical Disk
Plex
B = Block of data
disk01
disk01-01
disk01-01
B1
B2
B3
B4
devname
VM Disk
Physical Disk
Subdisks
disk01-01
disk01-03
disk01-02
Concatenated
devname
disk01
disk01-03
Volume
vol01-01
vol01
Plex
disk01-01
disk01-02
vol01-01
disk01-03
disk01-01
disk01-02
disk01-02
disk01-01
disk01-03