15.When all of the volumes that are processed by cartridge entry on the DR host are in SCRATCH status, they can be deleted from the TS7700 by using host EJECT processing. This process can be done using one of the following methods: 

– Run a TMS job to issue the EJECTs for these volumes. 

– Use ISMF to EJ ECT each volume. 

– Use the CBRSPLCS SAMPLIB member to eject each volume. 

16.Shut down the DR host. 

17.If the Management Class that is used on the DR cluster from Step 6 existed before the DR test and the Copy Mode was updated for the DR test, change the Copy Mode back to what it was before the DR test. 

18.If you want to prevent accidentally returning production volumes to SCRATCH by the DR host, keep the Write Protect Mode enabled on the DR clusters. 

19.Alternatively, you can disable Write Protect Mode in each DR cluster by using the TS7700 MI by selecting SETTINGS →  Cluster Settings →  Write Protect Mode →  Disable Write Protect Mode →  Submit Changes . 

20.If any production volumes were read by the DR host from the DR cluster during the DR test, those volumes are now owned by the DR cluster. To transfer the ownership back to the production cluster, use the LI REQ,OTCNTL  command with the START  keyword. For more information, see “Returning ownership of prod uction volumes to the production cluster” on page 779. 

## 14.5.3 Method 3: DR Testing without Write Protect Mode 

Another method that can be used to simulate that of a real disaster is to run your DR test from a DR host that is attached to one or more disaster clusters while the production hosts continue to write data across the grid. 

If your choice is between the use of Write Protect Mode and not using Write Protect Mode, it is recommended to use Write Protect Mode (Method 2), to provide another level of write-protection in case the TMS on the disaster host is not configured correctly to prevent writes to the production volumes. 

As with the previous method, the steps that are described in this section were written in a checklist format to provide a reference of the steps that are needed to complete this method. It is advised that you review all of these steps before an actual DR exercise, and during the DR exercise. Because the steps were written to apply to more than one TS7700 grid configuration, ensure that you understand each step and how it applies to your environment before running each step. 

To perform DR testing without Write Protect Mode, complete the following steps: 

1. Determine which MEDIA1, MEDIA2, ERROR, and PRIVATE categories will be used by the DR host during the DR test. These categories must be unique from any category that is used by a production system to ensure separation of production volumes from disaster volumes. 

2. By using the TS7700 MI, add the MEDIA1 and MEDIA2 categories that were 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 (see 14.3.3, “Cartridge entry considerations” on page 777) or use the LI DISABLE,CBRUXENT command to prevent host cartridge entry processing entirely. 

