FTP a dataset from MVS to Linux

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First, the BLKSIZE can't be 327560 (is this a typo)? The maximum is 32K (32760) for DASD and even on tape using the "new" Large BLKSIZE Interface (LBI) support the maximum is 256K (for 3590). I'll assume you meant 32760.

It might be easiest to convert the file to FB with LRECL=32756 prior to the FTP. A simple REXX program could be used. For example:

/* REXX */
"ALLOC FI(VBIN)  DA('my.file.VB') SHR REUSE"
"ALLOC FI(FBOUT) DA('my.file.FB') SHR REUSE"
"EXECIO  *  DISKR VBIN (FINIS"
queue ''
"EXECIO * DISKW FBOUT (FINIS"
"FREE  FI(VBIN)"
"FREE  FI(FBOUT)"
Exit 0

If you run this in batch you can allocate the files in JCL and don't need the ALLOC / FREE in the program.