I think your argument is even more compelling with the advent of Storage pool striping (rotate extents) in Version 1 Release 3 of the DS8100 microcode. Here's an excerpt from the Introduction and Planning Guide available at
http://www-1.ibm.com/support/docview.wss?uid=ssg1S7001073&aid=1 "Storage pool striping is now supported on the DS8000 series, providing improved performance. The storage pool striping function stripes new volumes across all ranks of an extent pool. The striped volume layout reduces administration that is required to balance system loads. With storage pool striping support, the system automatically performs close to highest efficiency, requiring little or no administration. The effectiveness of performance management tools is also enhanced, because imbalances tend to occur as isolated problems. When performance administration is required, it is applied more precisely. Storage pool striping can be managed and configured via the DS Storage Manager, DS CLI, and DS Open API. The storage pool striping function is provided with the DS8000 series at no additional charge." This no-charge feature became available late December 2007. Dan Squillace Sr. IT Manager, Mainframe Support SAS Institute Inc. Cary, NC USA phone: 919 531-7611 mobile: 919 606-0263 fax: 919 677-4444 email: [EMAIL PROTECTED] text pager: [EMAIL PROTECTED] -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Murray M. Robinson Sent: Tuesday, January 08, 2008 3:35 PM To: [email protected] Subject: Old habits with new DS6000 and DS8000 I am finding hard to persuade some old time IBM developers that planning to disperse dataset allocation as if they were accessing old discreet 3390 disks is a futile effort. Ignoring that with PAV and WLM goal mode and 3390s only logical and no one really knows were all the pieces are stored on the much fewer physical disks emulating thousands of volumes. I suggest use SMS without requesting Guaranteed space and placing their datasets on specific volumes is not getting through to them. Please help direct me to some decent documentation explaining this. Also if anyone knows when this technique is still relevant I'd love to know. Also which RMF screen gives a good snapshot of IO activity (and caching) Thanks. This e-mail message and any attachments may contain confidential, proprietary or non-public information. This information is intended solely for the designated recipient(s). If an addressing or transmission error has misdirected this e-mail, please notify the sender immediately and destroy this e-mail. Any review, dissemination, use or reliance upon this information by unintended recipients is prohibited. Any opinions expressed in this e-mail are those of the author personally. Murray Robinson ACI Worldwide, Inc. [EMAIL PROTECTED] (402)-778-1930 ---------------------------------------------------------------------- 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 ---------------------------------------------------------------------- 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
