COBOL; LBI changes with z/OS 1.12?

[don shaw]

Hi All,

A COBOL program compiled under V4.20 creates a VB output tape file, using BLOCK CONTAINS 0 RECORDS and no BLKSIZE in the JCL. Under z/OS 1.12 it creates a BLKSIZE of 65,520; some programs, such as COBOL and IDCAMS cannot read that file (S-013-e1 abend), but others such as DFSORT, IEBGENER and SAS can read it successfully. Probably caused by the use of different access methods.

How does the LBI get set? Is it related somehow to the TAPEBLKSZLIM=65520 which has been added to z/OS 1.12? Under z/OS 1.11, when TAPEBLKSZLIM was not specified, the BLKSIZE of the tape was 32760.

Thanks, ...Don