Roach, Dennis , N-GHG wrote:
Does it really make a difference? IIRC, starting with 3490, the control unit compressed and buffered the data and then wrote to the physical tape in a fixed, very large block size. This being the case, block size only impacts the channel utilization and with fiber channels, I have not seen this to be an issue.
It generally doesn't make a difference in tape utilization, but larger block sizes still reduce the number of passes thru the I/O supervisor (EXCP/STARTIO and I/O interupts). -- Richard ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
