Veritas FlashSnap Point-In-Time Copy Solutions 5.0 AdministratorÆs Guide, HP-UX 11i v3, First Edition, May 2008

14 Point-in-time copy solutions
Implementing point-in time copy solutions on a primary host
Figure 1-2 Example point-in-time copy solution on a primary host
In this setup, it is recommended that separate paths (shown as 1 and 2) from
separate controllers be configured to the disks containing the primary volumes
and the snapshot volumes. This avoids contention for disk access, but the
primary host’s CPU, memory and I/O resources are more heavily utilized when
the processing application is run.
Note: For space-optimized or unsynchronized full-sized instant snapshots, it is
not possible to isolate the I/O pathways in this way. This is because such
snapshots only contain the contents of changed regions from the original
volume. If applications access data that remains in unchanged regions, this is
read from the original volume.
Disks containing primary
volumes used to hold
production databases or file
systems
Disks containing synchronized
full-sized instant snapshot
volumes
Primary host
12
SCSI or Fibre Channel
connectivity