We have Z/VM 5.4, with 4 3590's attached to the z890 using FICON Express
with the 2-Gbps feature. The tape controller is the A60.
I am doing some tape speed tests and my results are not very good. I
have a pipeline(look below) that writes 65,500 byte blocks to the 3590.
I used the cms command TAPE MODESET ( NOCOMP/COMP to turn compression
off/on.
I see around 14 MB/sec with compression off and 28 MB/sec with
compression on.
The 3590 Planning manual says the 3590's should operate at 200MB/sec
when using FICON with the 2-Gbps feature.
There maybe a problem with my pipeline or my expectations.
Here is the pipeline. Any insight or suggestions are welcome.
/* */
arg blkcnt .
if blkcnt = "" then exit 99
numeric digits 12
"TAPE REW"
"TAPE FSF"
say time()
x = time("E")
"PIPE literal <------------> | >> tapetest 3590 a"
"PIPE (endchar ?) ",
"? xrange 00-ff |", /* 256 characters*/
" dup 256 |",
" specs todclock 1 1-* n |",
" join 256 |", /* 64k */
" dup * |",
" specs todclock 1 1-* n |",
" fblock 65500 00 |",
" take " blkcnt " |",
" cnt: count lines |",
" tape 181 |",
" specs 1-1 1 |",
" join 4999 |",
" specs todclock 1 |",
" dateconv 1.8 todabs ISODATE timeout |",
" specs recno 1 ",
" substring fs . f 1 of word 2 nw ",
" /5,000 Blocks Interval Check/ nw |",
" console |",
" >> tapetest 3590 a ",
"? cnt: | var xblkcnt | specs / Blocks written =/ 1 w 1 nw |",
" console"
____________________
Jim Hughes
603-271-5586
"It is fun to do the impossible."
