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370 Configuring off-host processing
Implementing off-host processing solutions
Off-host processing is made simpler by using linked break-off snapshots, which
are described in “Linked break-off snapshot volumes” on page 311.
Implementing off-host processing solutions
As shown in Figure 11-1, by accessing snapshot volumes from a lightly loaded
host (shown here as the off-host processing (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
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