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

13Point-in-time copy solutions
Implementing point-in time copy solutions on a primary host
Implementing point-in time copy solutions on a
primary host
Figure 1-1 illustrates the steps that are needed to set up the processing solution
on the primary host. Note that the Disk Group Split/Join functionality is not
used. As all processing takes place in the same disk group, synchronization of
the contents of the snapshots from the original volumes is not usually required
unless you want to prevent disk contention. Snapshot creation and updating are
practically instantaneous.
Figure 1-1 Using snapshots and FastResync to implement point-in-time copy
solutions on a primary host
Figure 1-2 shows the suggested arrangement for implementing solutions where
the primary host is used and disk contention is to be avoided.
Volume
Primary host
If required, create a cache or
1. Prepare the volumes
empty volume in the disk group,
Cache or
empty
volume
Volume
Snapshot
volume
Apply the desired processing
4. Apply processing
application to the snapshot volumes.
Volume
Snapshot
volume
Use vxsnap make to create instant
2. Create instant snapshot volumes
snapshot volumes of one or more
volumes.
Volume
Snapshot
volume
If required, use
vxsnap refresh to
3. Refresh the instant snapshots
update the snapshot volumes and
make them ready for more processing.
Repeat steps
3 and 4 as
required.
and use
vxsnap prepare to prepare
volumes for snapshot creation.