Replace DASD Control Files

Advanced Topics › Control and Checkpoint File Considerations › How You Replace Control Files › Replace DASD Control Files

Replace DASD Control Files

To replace a DASD control file, de-allocate that file using the DEALLOCATE command and then allocate a new file using the ALLOCATE command. You must issue these commands on all systems in the complex.

For example, suppose that the control file identified on the //MIMTBL03 DD statement in your startup procedure becomes unusable, and you want to replace it.

To replace DASD control files

De-allocate the control file by issuing the following command:
```
DEALLOCATE DDNAME=MIMTBL03
```
Physically allocate a new control file by customizing and submitting the sample JCL in the ALLOCCF member of the CAI.CBTDJCL data set.
To make file MIM.NEW03 available to the CA MIM address space, issue the following command:
```
ALLOCATE DDNAME=MIMTBL03 DSNAME=MIM.NEW03
```
Repeat Step 3. on all systems, using the new DDNAME and DSNAME.

The ALLOCATE command formats the control file automatically, so you do not need to restart CA MIM.

Notes:

You cannot replace a DASD control file that you are currently using. You need to migrate to a new control file first and then replace the control file that you abandoned.
For more information about migrating between DASD control files, see Migrate to a DASD Control File.