EXPAND: Expanding a control data set record

Explanation: EXPAND(bytes) is an optional parameter specifying that a control data set record be expanded by the specified number of bytes. The new portion of the record is set to binary zeros. For bytes, substitute a decimal number for the number of bytes by which you want the record to be expanded.

Abbreviations: None.

Defaults: If you do not specify one of the optional parameters of FIXCDS, the default is DISPLAY.

Note:

If the expanded record length is more than 2040 bytes, the FIXCDS command fails.
If you expand the CDS record length beyond the maximum record length specified when the control data set was defined, your CDS may become unreadable.
If a backup cycle volume record (BVR) is being expanded, the specified length must be an even multiple of 12 bytes, the length of the volume entry in the BVR.
If a BVR is being expanded, the resultant record length must not be able to contain more than the maximum number of volume entries. If the maximum record length is 1016 bytes in length, 78 entries can be put in each BVR. If the maximum record length is 2040 bytes in length, 164 entries can be put in each BVR.
When a BVR is expanded, the number of volume entries is incremented to reflect the new number of volume entries. If you subsequently update these new volume entries with volume serial numbers, you must ensure that the volume full flag is turned off in the BVR by using the appropriate FIXCDS PATCH command.
When expanding a record that was created by a previous release of DFSMShsm, the results may not be as expected. The length of CDS records may change from release to release, and DFSMShsm enforces writing and rewriting records to the correct release. After issuing an EXPAND request, DISPLAY the record to ensure that the expected results have been achieved.