Managing Systems and Workgroups: A Guide for HP-UX System Administrators

Administering a System: Managing Disks and Files
Managing Disks
Chapter 6 559
In Figure 6-1, logical volume /dev/vg01/lvol1 might contain a file
system, /dev/vg01/lvol2 might contain swap space, and
/dev/vg01/lvol3 might contain raw data. As the figure illustrates,
a file system, swap space, or raw data area may exist within a logical
volume that resides on more than one disk.
Figure 6-1 Disk Space Partitioned into Logical Volumes
• If a logical volume spans multiple physical volumes, it is not required
that each disk be of the same interface type except in the case of
HP-IB disks; however, having the same interface type will result in
better performance. See “Using Disk I/O Interfaces” on page 567 for
more information on interface types and limitations.
How LVM Works
• LVM divides each physical disk into addressable units called
physical extents. Extents are allocated to disks sequentially
starting from the beginning of the disk with address zero, and