Brian, Thanks for the response. We have been doing more digging, and are looking at our storage arrays to make sure everything is performing as planned. _________________________________________________________________ Dave Jousma Assistant Vice President, Mainframe Services [email protected] 1830 East Paris, Grand Rapids, MI 49546 MD RSCB1G p 616.653.8429 f 616.653.8497
-----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Brian Westerman Sent: Friday, August 14, 2009 11:00 PM To: [email protected] Subject: Re: Degraded I/O performance in 1.10? Back to the original question/problem. I'm assuming that your programmers are not complaining that they problem is the number of I/O's or EXCPS have gone up because they could probably check those figures for themselves in the actual JOB output, but that it "feels" to them like jobs that do a lot of I/O seem to be taking longer to run. This could be any of several issues related to your parmlib settings or WLM settings where you are penalizing high I/O, or could be a hardware issue that coincided with your OS upgrade. I couldn't even count the number of problems that I have searched on during and after upgrades that turned out to be something that the site's CE decided to implement during the "outage". So don't limit your searching to z/OS 1.10 possibilities as it could very well be a hardware issue that you had very little control over. Check to be sure that your WLM settings have not changes in an unwarranted manner. This may not be an issue of everything being bad, just that some jobs are now taking longer while a lot of others are running "faster". I think you shoudl probably err on the side of caution and assume that they have a point until you can prove otherwise. They won't believe you anyway without proof. If you were allowed to function without proof, you would be one of them. :) Have you checked to be sure that your PAV settings are still there. You may have lost your dynamic PAV in the quest for HyperPAV. Also, you may want to see if your CE (IBM or other) has made changes to your RAID. It's possible that you may have lost some cache, or some of the features are not set as they were previously. Is it only certain datasets, or certain volumes (or subsets of volumes) that "appear" to be affected? For instance, is it only a few VSAM files that may exhibit the perceived problem? What has changed (if anything) about their location? Once you can quantify something concrete, it will make the job much easier. Once you locate some common threads you can start to zoom in on where the issue is presenting itself and figure out what may have changed. It's also completely possible that there may not be a problem, but programmers, (being what they are), will need you to "prove" that nothing has changed. If you check everything and see absolutely no difference in the jobs, then you can move into that response. If you need to contact me offline about this, feel free to do so and let me know what I can do to help. Brian ---------------------------------------------------------------------- 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 This e-mail transmission contains information that is confidential and may be privileged. It is intended only for the addressee(s) named above. If you receive this e-mail in error, please do not read, copy or disseminate it in any manner. If you are not the intended recipient, any disclosure, copying, distribution or use of the contents of this information is prohibited. Please reply to the message immediately by informing the sender that the message was misdirected. After replying, please erase it from your computer system. Your assistance in correcting this error is appreciated. ---------------------------------------------------------------------- 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
