-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On
Behalf Of David Day
Sent: Wednesday, August 23, 2006 2:27 PM
To: [email protected]
Subject: DASD Response Time
I'm developing some code on a Flex-es machine and would like to try
to see how the code will work in a real environment. I don't know if it
is Flex-es or Linux that is caching the I/O, but the response time the
application sees is extremely good. The Flex system has the ability to
delay the I/O that it delivers to MVS. I would like to set these delay
values to something that more resembles actual I/O response times. If
someone can give me some values to plug in, I'd appreciate it. 3390's,
with and without a caching controller. I know the values vary with
cached controllers and hit ratios. I'm interested in the response time
RMF reports when the data is found in the cache. Thanks.
<snip>
You are also aware your timings depend on ESCON v. FICON, actual DASD v.
RAID based, etc.?
If I understand FLEX-ES, the I/O is actually done by the "service"
processor (*NIX based underlying system).
And do I understand correctly, they now support ESCON channel
attachment? All the times when I've checked before, they were parallel
attached only (with the exception of the internal I/O devices) and were
not getting much cooperation from a Large NY based company for ESCON
specs.
Later,
Steve Thompson
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