VERITAS Volume Manager 4.1 Administrator's Guide

Configuring Off-Host Processing
Implementing Off-Host Processing Solutions
Chapter 11 385
option to resynchronize the snapshot plexes. You cannot use vxassist
snapback for this purpose. This restriction does not apply if you split a
snapshot volume into a separate disk group from its original volume, and
subsequently return the snapshot volume to the original disk group.
For more information, see “Volume Snapshots” on page 50 and
“FastResync” on page 52.
Disk Group Split and Join
NOTE You may need an additional license to use this feature.
A volume, such as a snapshot volume, can be split off into a separate disk
group and deported. It is then ready for importing on another host that is
dedicated to off-host processing. This host need not be a member of a
cluster but must have access to the disks. At a later stage, the disk group
can be deported, re-imported, and joined with the original disk group or
with a different disk group.
For more information, see “Reorganizing the Contents of Disk Groups”
on page 172.
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