-----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Kelman, Tom Sent: Wednesday, April 02, 2008 2:28 PM To: IBM-MAIN@BAMA.UA.EDU Subject: Software cost savings from a zIIP
This has been cross posted to the MXG-Listserv. =20 We will be moving from DB2 v7 to DB2 v8 this weekend and then getting a zIIP engine shortly. We are currently at z/OS v1.7 with plans to get v1.9 installed on all LPARs by the end of the summer. Since the z/OS system programmers are working on the v1.9 installation they don't want to take the time to install the FMID to pick up the zIIP engine information in the SMF records. Also, the plans are to just drop a zIIP loaner in place and try it out instead of sending the data to IBM (Sirius in our case) to do the study. However, I've been asked to estimate the software cost that will be saved by the zIIP engine. I'm thinking this way. Our DB2 DDF workload has grown from nothing to using 10% of the processor during that last year. I know that DB2 DDF will be the major workload eligible for zIIP processing, but I also know that not all of it will end up on the zIIP engine. From what I've heard about 60% of it will end up there. So that means that about 6% of our CPU, or about 8 MSUs, will be moved from the general purpose engines to the zIIP. Am I correct in my thinking or am I way off base? I have Al Sherkow's LCS software with the accompanying costing tables so once I have an estimate as to how many MSUs will move it'll be easy to calculate the cost savings. Any advice would be greatly appreciated. =20 <SNIP> IF the zIIP is running at 100% vs. your normal CPUs running at <100% (based on model type, not workload, so 784MIPs vs. say 200MIPs), then you should see a reduction in wall time for your DB2 based applications -- assuming that you have the memory to hold the tables in storage, you should see quite a bit of improvement. Now this is based on white board stuff, and not actual experience. YMMV Regards, Steve Thompson -- All opinions expressed by me are my own and may not necessarily reflect those of my employer. -- ---------------------------------------------------------------------- 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
