Changing the Size of the Active Transfer File

Note: Online users must not access the Online facility while the size of the ATF is being changed.

Perform the following steps to change the size of the ATF:

1. Rename the current ATF—which is the input file for the copy operation and its backup file—using, for example, ISPF 3.2 or 3.4.

   Note: The backup Active Transfer file suffix is ATB.

2. Perform the following steps:
   1. Enter ICE and select Customization.
   2. In the Customization screen, set Product ID to CTD.
   3. Select major step 6, "Customize Control-D Data Set Parameters."
   4. Select minor step 2, "Control-D Data Set Parameters."
   5. Change the size of the new ATF by modifying the value of the ATFBLK parameter from, for example, 300 blocks to 400 blocks.
   6. Select minor step 3, "Save Parameters into Product Libraries."
   7. Select minor step 6, "Format the A.T.F. File."
3. Edit the CTDCATF member in the Control-D JCL library. Change DD statement INATF to match the name specified in Step 1, as follows:

   // EXEC CTDCATF,P=COPY,

   // INATF='old-dsname', OLD ACTIVE TRANSFER FILE

   // OUTATF='new-dsname'

   where

   • old-dsname is the name specified in Step 1.
   • new-dsname is the new DSN.
4. Run the CTDCATF utility to copy the current ATF to the new ATF. You must terminate the utility with a return code of 0.
5. Restart the Control-D monitor and resume operations.