2. By using the TS7700 MI, add the MEDIA1 and MEDIA2 categories that are chosen to the TS7700 by selecting Virtual → Categories → Add Scratch Category . 

3. Choose the volume serial ranges that will be created and used for input/output processing on the DR host. Update the TMS on the production hosts to ignore the ranges during host cartridge entry processing (for more information, see 14.3.3, “Cartridge entry considerations” on page 777) or use the LI DISABLE,CBRUXENT  command to prevent host cartridge entry processing entirely. 

4. On each DR cluster, ensure that the Management Classes that will be used by the DR volumes on the DR hosts do not make copies to other clusters in the grid when the DR volumes are written to. If wanted, define a new Management Class on the DR clusters to be used specifically for DR testing. On each DR cluster, set the Copy Mode for the Management Class that is used to No Copy for each non-DR cluster by selecting Constructs →  Management Classes . 

5. Restart the DR host and restore the DR environment from the production environment. 

6. By using the unique categories that were chosen in Step 1, define these MEDIA1, MEDIA2, ERROR, and PRIVATE categories in the DEVSUPxx member on the DR host. These categories will be used by volumes that are created for use by the DR host during the DR test. After the categories are defined, restart the DR host to ensure that the categories are used. 

Alternatively, use the DS QL,CATS command to dynamically set the categories without an IPL. If this alternative is used, be sure to update the DEVSUPxx as well with the new categories so that the categories continue to be used if an IPL occurs. 

7. Update the TMS on the DR host to enable the new volume serial ranges to be accepted during host cartridge entry processing. For more information, see 14.3.3, “Cartridge entry considerations” on page 777. 

8. Update the TMS on the DR host to reject any output that is directed towards volumes in the production volume serial range. This process is done as a safeguard to protect against production tapes being accidentally written to by the DR host. For more information, see “TMS Write Protection” on page 776. 

9. If a new Management Class was defined for each DR cluster in Step 4, modify the ACS routines on the DR host to direct new tape allocations to this Management Class. Activate the new SMS configuration on the DR host. 

10.On the DR host, vary online the devices to the DR clusters. 

11.By using the TS7700 MI, insert the new volume serial ranges by selecting Virtual → Virtual Volumes → Insert a new virtual volume range . Verify that the DR Host successfully processed the volumes during cartridge entry by reviewing the SYSLOG for the CBR3610I messages surfacing those volumes. If the LI DISABLE,CBRUXENT  command was used in Step 3, use the LI RESET,CBRUXENT  command on those production hosts to re-enable the ability to run host cartridge entry processing. 

Note:  You must insert the DR volume serial range before  completing the next step (breaking the grid links). After the grid links are broken, you cannot insert volumes to the DR cluster unless read/write ownership takeover mode is enabled, which is not recommended because it can allow production volumes to be written to by the DR host. 

12.Contact your CE to break the grid link connections between the production clusters and the disaster clusters. Do not  disable a grid link by using the Library Request  command. Disabling the grid link by using this command does not stop synchronous mode copies and the exchange of status information. 

