> -----Original Message----- > From: IBM Mainframe Discussion List > [mailto:[email protected]] On Behalf Of Ted MacNEIL > Sent: Tuesday, July 28, 2009 3:52 PM > To: [email protected] > Subject: Re: Suggested MEMLIMIT value for SMFPRMx > > > I couldn't disagree more! See all the past discussions > about REGION=0M when systems were "small". > > BTDT. > > >There is nothing keeping an unauthorized program or user > trying to play with 100G of 64-bit virtual storage and > crashing my system if I don't control it. > > You have NO right to control. > And, when does it happen OVERNIGHT? > > > >64-bit is a bigger place you can almost imagine. > >You couldn't plan enough aux storage to back a mistake > Yes, but, I could say the same with 3350's and 31-bit addressing. > > It doesn't suddenly happen, and if the business needs it, you > have no right to stop it!
The limit needs to be established and documented as a "shop standard", hopefully based on business need (not programmer laziness). Once established, it need to be enforced (in the DASD area, we have programmer who simply don't care to try to size datasets. They simply allocate huge amounts and complain if there isn't enough on the floor). But there needs also to be a way to have the limit adjusted based on changing needs. Also, I put the limit where I want it. If it causes a problem, it __should__ be detected in test, before any business problem occurs. And then the reason for the need can be explained. Buffering a 10G VSAM file in memory is not a good reason (IMO). And, yes, we have programmers who want to do that sort of thing. -- John McKown Systems Engineer IV IT Administrative Services Group HealthMarkets(r) 9151 Boulevard 26 * N. Richland Hills * TX 76010 (817) 255-3225 phone * (817)-961-6183 cell [email protected] * www.HealthMarkets.com Confidentiality Notice: This e-mail message may contain confidential or proprietary information. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. HealthMarkets(r) is the brand name for products underwritten and issued by the insurance subsidiaries of HealthMarkets, Inc. -The Chesapeake Life Insurance Company(r), Mid-West National Life Insurance Company of TennesseeSM and The MEGA Life and Health Insurance Company.SM ---------------------------------------------------------------------- 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
