The AC_TAPEBLOCK configuration parameter specifies the size of the tape block in kilobytes when an archive is performed using the following commands:
When you use ON-Bar, the value of AC_TAPEBLOCK should be the value the BAR_XFER_BUFSIZE (XPS) or BAR_XFER_BUF_SIZE (IDS) configuration parameter multiplied by the current page size. For more information, see BAR_XFER_BUFSIZE (XPS) or BAR_XFER_BUF_SIZE (IDS).
When you use ontape, the value of AC_TAPEBLOCK should be the value that the TAPEBLK ONCONFIG configuration parameter was set to at the time of the archive. For more information, see Specifying the Tape-Block-Size Parameters.