HP XP P9500 Storage - Manual (Page 70)

Transfer operations back to the primary site
When host operations are running at the secondary site, the primary site should be restored and
operations transferred back.
In the following procedure, you will establish Continuous Access Synchronous pairs at the secondary
site, with data flow moving from the secondary site to the local. After the pairs are synchronized
and in PAIR status, they will be released, then new pairs will be created at the local site with data
flow moving from local to remote, as originally set up.
Procedure 23 To transfer operations to the primary site
1. At the local site, bring up the host server(s). Make sure that Continuous Access Synchronous
components are operational.
2. At the local site, release all Continuous Access Synchronous pairs on the primary system.
The Delete Pair by Force option must be used since the paired S-VOLs are in the SMPL state
at the secondary site.
3. At the local site, delete the Continuous Access Synchronous association with the secondary
systems (Delete RCU). In Remote Web Console, connect to each primary system and each CU
to make sure that all RCUs are deleted.
4. At the local and remote sites, change path and port settings.
•
If you plan to use the same data paths:
◦ At the secondary site, change the existing RCU target ports to initiator ports.
◦ At the local site, change the existing initiator ports to RCU target ports.
•
To use the same switches, change the operating mode to the opposite direction.
•
To use the same channel extenders, change the operating mode to the opposite direction.
The boxes/nodes connected to the primary system must be set to channel-mode, and the
boxes/nodes connected to the secondary systems must be set to device-mode.
5. At the secondary site, perform Continuous Access Synchronous configuration procedures,
setting up the Continuous Access Synchronous system with the remote site as the primary
system, and the local site as the secondary system.
6. At the secondary system create the Continuous Access Synchronous pairs, with the S-VOLs at
the local site. Make sure to use the Entire Volume initial copy option. Confirm that the pairs
are created and that status is PAIR.
7. At the secondary system, halt host operations and vary the P-VOL offline. This maintains
synchronization of the pairs.
8. At the secondary site, split the pairs. Confirm that the pairs are split and status is PSUS before
proceeding. If an error occurs, resolve it before proceeding.
9. At the secondary system, release the pairs. You do not need to use the Delete Pair by Force
option.
10. At the primary and secondary systems, change the path and port settings.
•
If you plan to use the same data paths:
◦ At the local site, change the existing RCU target ports to initiator ports.
◦ At the secondary site, change the existing initiator ports to RCU target ports.
•
To use the same switches, change the operating mode back to the original direction.
•
To use the same channel extenders, change the operating mode back to the original
direction. The boxes/nodes connected to the primary system must be set to channel-mode,
and the boxes/nodes connected to the secondary systems must be set to device-mode.
11. At the primary site, perform configuration tasks in preparation for creating the pairs.
70 Planning and procedures for disaster recovery