Veritas Volume Manager 5.0 Administrator's Guide (September 2006)

362 Configuring off-host processing

Implementing off-host processing solutions

As shown in Figure 11-1, 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 off-host online backup

■ Implementing decision support

These applications use the Persistent FastResync feature of VxVM in conjunction with

linked break-off 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