VERITAS Volume Manager 3.5 Administrator's Guide (September 2004)

Configuring Off-Host Processing
Implementing Off-Host Processing Solutions
Chapter 11 375
Implementing Off-Host Processing Solutions
As shown in Figure 11-1, “Example Implementation of Off-Host
Processing,” by accessing snapshot volumes from a lightly loaded host
(shown here as the OHP host), CPU- and I/O-intensive operations for
online backup and decision support do not degrade the performance of
the primary host that is performing the main production activity (such
as running a database). Also, if you place the snapshot volumes on disks
that are attached to different host controllers than the disks in the
primary volumes, it is possible to avoid contending with the primary host
for I/O resources.
Figure 11-1 Example Implementation of Off-Host Processing
The following sections describe how you can apply off-host processing to
implement regular online backup of a volume in a private disk group,
and to set up a replica of a production database for decision support. Two
applications are outlined in the following sections:
• “Implementing Online Backup” on page 376
Disks containing primary
volumes used to hold
production databases or
file systems
Disks containing snapshot
volumes used to
implement off-host
processing solutions
SCSI or Fibre
Channel
Connectivity
OHP Host
Primary Host