My example was not necessarily reality. You are assuming the file has more CI's than specified buffers. I can't discuss details, but for my situation sometimes that is true and sometimes it isn't true, and I am trying to achieve a reasonable balance. I can't do that without measurements that tell me (and my mgmt) actual usage.
And no, VSAM will not always use as many buffers as are allocated. Simple example, if there are only 100 CI's in the file, only 100 buffers will be used, and (from my not-real example) 2600 data buffers would be unused. It's not that simple of course. It has nothing to do with paging counts either. Thanks anyway for your comments. Peter -----Original Message----- From: Wertheim, Marty [mailto:[EMAIL PROTECTED] Sent: Tuesday, May 08, 2007 9:32 AM To: [email protected] Subject: Re: Measuring Use of BLSR Buffers Peter, I think that VSAM will use as many buffers as there are available. In other words, if you have 2700 data buffers and read 2700 different CI's, VSAM will use all 270 buffers. The question then is how much you can reduce the buffers without (significantly) increasing the EXCP count. I don't know how you can determine this other than testing at different levels. I'm curious as to why you are concerned with BLSR buffers. Do you have high paging counts when these jobs are running? Marty Wertheim Mainframe Performance Management 972-245-4632 This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system. ---------------------------------------------------------------------- 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
