Re: Websphere, zIIPs and zAAPs
- From: Larry.A.Gray@xxxxxxxxx (Gray, Larry - Larry A)
- Date: 4 Aug 2006 09:49:06 -0700
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With the type 4 driver, you will have to watch how far into the network
some of your data might flow if you have any "protected" information.
Since the type 2 drivers are memory transfers only, there is no
exposure. I had not actually thought of what you are proposing with
WAS, but I plan to look at the zIIPs once we get the correct hardware
and software. That might be an extra bonus if not too expensive.
The one issue I will have is our short timeout value on the DDF
connections. We have DDF drop connections after three minutes of no
use. This can play havoc with your connection pools if not set
correctly. You do not have that problem with type 2 connections.
BTW, just downloaded WAS for z/OS 6.1 Wednesday and hope to get to start
Monday.
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@xxxxxxxxxxx] On
Behalf Of Aaron Walker
Sent: Friday, August 04, 2006 10:00 AM
To: IBM-MAIN@xxxxxxxxxxx
Subject: Websphere, zIIPs and zAAPs
I posed this question to one of my favorite WebSphere on zOS people, and
got a shaky answer, so I'll float it here. I'm thinking of posting on
the
WebSphere list, but I think I'll get better traction here!
I was wondering if anyone has done any CPU comparisons between running
one's JDBC connections to DB2 on zOS via RRSAF versus DDF (type 4
driver)
on the new System z with zAAPs and zIIPs. We're on a few z900s right
now,
and are trying (oy, what a story) to get a z9bc and z9ec with some zIIPs
and zAAPs.
As you may know, running with type 2 RRSAF connections is much more
efficient than type 4 DDF. However, with the advent of zIIPs, I didn't
know
if we could get a lower TCO on the z9 if I switched my connections to
type
4 to take advantage of the zIIP processors. Assuming that we are running
the Java on the zAAPs, how much of the overhead of serialization and
deserialization would be running on the specialty engines. I would
assume
that TCPIP overhead of trucking that data through would be a not-
insignificant hit, but in the end would we come out ahead? I am
assuming,
of course, that by using the type 4 JDBC driver we would be able to take
advantage of the zIIPs. If I'm wrong in that assumption, this line of
inquiry is moot.
If you have any thoughts on this, I'd appreciate hearing them!
Thanks,
Aaron
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