Re: MVT COBOL under MVS3.8j.

One might try values closer, or maybe a few times larger, then those suggested in the manual.
 

 In the DOS/Windows/OS/2 days, I remember a few times having programs decide
 that they didn't have enough memory or disk space, doing the calculation and
 not detecting overflow.  If 3GB of disk was available, a program might see this
 as -1GB, so not enough.  

 

 It isn't so obvious in this case, but I do suspect that the OS/360
 compiler writers didn't consider that 16383K might be available.
 

 Note also that buffer sizes depend on BLKSIZE, and the buffers might
 be bigger than the program expects.   It might be that a BLKSIZE on
 a DD statement, or even a disk with smaller track size is needed.