Configuring Your Product › LIB/CCF System Master File Conversion

LIB/CCF System Master File Conversion

LIB/CCF supports VM/ESA, z/VM, and DB2. The format of certain LIB/CCF control records stored on the System Master File has changed:

• A library definition (LDR) now contains a four-character VM/ESA and z/VM address instead of a three-character VM/ESA and z/VM address.
• An LCDF chain now contains a field for a DB2 DBRM library name.

Therefore, an automatic conversion of these records takes place through release 4.4 LIB/CCF processing. When entering Option 12.11 of LIB/CCF, the conversion occurs automatically if there are release 3.8 chains or library definitions found on the System Master File. If no release 3.8 chains or library definitions are found, no conversion is necessary. Once the process is complete, LCDF displays the message CONVERSION PERFORMED. Press PF1 to display the message CDF066: LCDF HAS CONVERTED FROM 3.8 TO 4.4 FORMAT. LCDF checks for release 3.8 chains or library definitions every time Option 12.11 is entered and performs the conversion whenever necessary.

Attempting to use an unconverted release 3.8 format System Master File with any release 4.4 LIB/CCF function that requires LCDF information (other than Option 12.11) results in the message OLD CHAIN/LDR. Pressing PF1 displays the following message:

CDF067     T4nnnnn/T5nnnnnn MUST BE CONVERTED BEFORE USE.

Once the conversion process is complete, it is still possible to execute release 3.8 LIB/CCF against the release 4.4 System Master File. However, the following restrictions apply:

• If a library definition was updated with a four-character VM/ESA and z/VM address through Option 12.11.3 of release 4.4, release 3.8 displays the address as XXX. If this library definition is used with release 3.8 LIB/CCF, it must be corrected through Option 12.11.3 of release 3.8 by entering a valid three-character VM/ESA and z/VM address. Otherwise, LIB/CCF supplies the invalid address of XXX for subsequent processing. Thus, correcting the address converts the library definition back to the release 3.8 format.
• If Option 12.11.2 is used to modify a chain, that chain is converted back to the release 3.8 format, that is, the DBRM library name field is removed.

For the purposes of testing release 4.4, you can execute both release 3.8 and 4.4 LIB/CCF against the same 4.4 System Master File. However, once release 4.4 is fully implemented, we strongly recommend that you discontinue using release 3.8 to avoid confusion due to the restrictions listed previously.