> With current emulated DASD and PAVs, performance is probably no longer an > issue, but I believe multiple page data sets on one volume is still a > potential availability issue: You wouldn't >want failure of a single > emulated drive to compromise two different systems at the same time, and I > seem to recall it used to be fatal to have failure of multiple page data sets > on the same >system at the same time.
You seem to have intermixed mixed "volume" and "emulated drive". Unless the recommendation has changed, there should only be one page dataset per MVS volume. IIRC MVS remembers the last head position and performance suffers when the head has moved. If you are considering the backend SCSI drives used when emulating MVS volumes, they are in a RAID array which is designed to tolerate SCSI failures. I don't pay any attention to them. It may be time to revisit old paging ROTs. Does anyone have a double or triple digit paging rate anymore? Is the 30% rule still valid? (We completely ignore it). Does zFlash obviate the old ROTs? Bob Shannon Rocket Software ================================ Rocket Software, Inc. and subsidiaries ■ 77 Fourth Avenue, Waltham MA 02451 ■ +1 800.966.3270 ■ +1 781.577.4321 Unsubscribe From Commercial Email – unsubscr...@rocketsoftware.com Manage Your Subscription Preferences - http://info.rocketsoftware.com/GlobalSubscriptionManagementEmailFooter_SubscriptionCenter.html Privacy Policy - http://www.rocketsoftware.com/company/legal/privacy-policy ================================ This communication and any attachments may contain confidential information of Rocket Software, Inc. All unauthorized use, disclosure or distribution is prohibited. If you are not the intended recipient, please notify Rocket Software immediately and destroy all copies of this communication. Thank you. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
