Veritas Storage Foundation Intelligent Storage Provisioning 5.0 Solutions Guide, HP-UX 11i v3, First Edition, May 2008

26 Off-host processing solutions
Implementing off-host processing solutions
Off-host processing is made simpler by using linked break-off snapshots, which
can be set up in a different disk group from the data volume. This makes them
especially suitable for off-host processing applications where you may want to
create the snapshot on storage with different characteristics from that used for
the data volumes.
Implementing off-host processing solutions
As shown in Figure 4-1, 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.
Database error recovery Logic errors caused by an administrator or an application
program can compromise the integrity of a database. By
restoring the database table files from a snapshot copy, the
database can be recovered more quickly than by full
restoration from tape or other backup media.