Hitachi TrueCopy for IBM z/OS User and Reference Guide (T5211-96001, June 2007)

7-14 TrueCopy for z/OS Usage Scenarios
Hitachi Universal Storage Platform V TrueCopy for IBM z/OS User’s Guide
Resuming Normal Operations at the Main Site
Once the TrueCopy for z/OS pairs have been established in the reverse
direction, you are ready to resume normal operations at the main site.
Remember that the TCz terminology is now reversed: the original RCUs and
R-VOLs (remote site) are now the MCUs and M-VOLs, and the original MCUs
and M-VOLs (main site) are now the RCUs and R-VOLs.
To resume normal operations at the main site:
1. At the remote site, make sure that all TCz pairs are in the duplex state. This
indicates that the TCz initial copy operations are complete.
2. Halt the applications at the remote site, and vary the M-VOLs (original R-
VOLs) offline at the remote site. This maintains synchronization of the TCz
Synchronous pairs.
3. At the remote site, suspend all TCz pairs at the MCUs (original RCUs) to
destage any pending data from cache. Confirm that the pairs are suspended
before proceeding. If an error occurs, resolve it before proceeding.
4. At the remote site, release all TCz pairs at the MCUs (original RCUs) using the
Deleting Mode-All option for TCz sync pairs and the Delete Range-Group
option for TCzA pairs. For TCzA pairs, the MCU and RCU complete all pending
updates before changing the pair status to simplex.
5. At the remote site, change the TCz settings at the MCUs (original RCUs) to
prepare for normal TCz operations. Delete the TCzA groups and the RCUs
(original MCUs). If you plan to use the same remote copy connections,
reconfigure the ports (change initiator ports back to ordinary target ports for
fibre). If system option mode 114 is enabled on all MCUs and RCUs, the ports
will reconfigure automatically if you use the TSO CESTPATH command to add
the pairs at the main site.
Note: For fibre-channel interface, do not use the CESTPATH and CDELPATH
commands at the same time as the SCSI path definition function of LUN
Manager. The fibre-channel interface ports need to be configured as initiator
ports or RCU target ports before the CESTPATH and CDELPATH commands are
issued.
6. If you plan to use the same channel extenders, change the operating mode
back to the original direction. The boxes/nodes connected to the MCUs must
be set to channel-mode, and the boxes/nodes connected to the RCUs must
be set to device-mode.
7. At the main site, configure the initiator ports, add the RCUs, and add the
TCzA groups. If system option mode 114 is enabled on all MCUs and RCUs,
the ports will reconfigure automatically if you use the TSO CESTPATH
command to add the pairs at the main site.