A Version 14.0 Directory (CXX) has no compatibility with a Version 12.0 CXX, and there is no support in Version 12.0 to access a Version 14.0 CXX. The CXX is installed as Version 14.0, but there is a procedure by which the CXX can be made to fall back to a Version 12.0 CXX. Another procedure provides a way to fall forward from a Version 12.0 CXX to a Version 14.0 CXX.
The lack of compatibility between a Version 14.0 CXX and a Version 12.0 CXX is due to the added features Version 14.0 provides. For example, the Version 14.0 CXX possesses information about the following:
Note: Some structures are larger with Version 14.0, but the difference is most likely invisible. It is possible to find that a full CXX at Version 12.0 has converted to Version 14.0 with the same number of tracks found in Version 12.0.
The procedure to fall back to a Version 12.0 CXX from a Version 14.0 CXX takes the following into account:
The Version 12.0 Log File (LXX) fixed block format is not supported in Version 14.0. The Version 14.0 Multi-User Facility (MUF) requires the LXX to be either variable or spanned before it can be successfully opened in Version 14.0.
Variable:
INIT AREA=LXX,BLKSIZE=32760,VARIABLE=YES)
Spanned:
INIT AREA=LXX,BLKSIZE=nnnnn,BLOCKS=n
Both formats are valid in Version 12.0. Therefore, this can be done either before upgrading to Version 14.0 or in conjunction with upgrading to Version 14.0. In either case, the FXX must also be initialized using the same block size as the LXX.
Note: For acceptable values, see the CA Datacom DBUTLTY Reference Guide for z/OS Version 14.0.
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