Veritas Volume Manager 4.1 Administrator's Guide (HP-UX 11i v3, February 2007)
Chapter 11, Configuring Off-Host Processing
Implementing Off-Host Processing Solutions
317
Implementing Off-Host Processing Solutions
As shown in “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.
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
◆ Implementing Decision Support
These applications use the Persistent FastResync and disk group move, split and join
features of VxVM in conjunction with volume snapshots.
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