Veritas Storage Foundation 5.1 SP1 Advanced Features Administrator"s Guide (5900-1503, April 2011)

backup and decision support are prevented from degrading the performance of
the primary host that is performing the main production activity (such as running
a database).
Figure 11-3
Example implementation of an off-host point-in-time copy solution
Network
Disks containing primary
volumes used to hold
production databases or file
systems
Disks containing snapshot
volumes
SCSI or Fibre
Channel connectivity
OHP host
Primary Host
1 2
Also, if you place the snapshot volumes on disks that are attached to host
controllers other than those for the disks in the primary volumes, it is possible
to avoid contending with the primary host for I/O resources. To implement this,
paths 1 and 2 shown in the Figure 11-3 should be connected to different controllers.
Figure 11-4 shows an example of how you might achieve such connectivity using
Fibre Channel technology with 4 Fibre Channel controllers in the primary host.
Understanding point-in-time copy methods
About point-in-time copies
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