After changing the blocksize (BLKSIZE) of any of the VLS libraries, the CICS FCT entry of the library must be checked and modified.
Environment
Z/OS
Z/VSE
Resolution
The blocksize of the library and the recordsize in the FCT must match.
To verify the blocksize of the VLS library, run a VLSUTIL LIBRARY listing against the library. The end of the report will list the Blocksize and the Namelen.
To verify the recordsize in the File Control Table (FCT), in CICS,
issue the command CEMT I FI(your VLS file) and press enter.
place 'S' next to Fil and press enter.
look for Recordsize. The Recordsize must match the BLKSIZE that was specified in the VLSUTIL FORMAT job. If not, various errors are expected, errors like 1-ICSCERRP23E - INTERR: Internal LIB error.