Thanks Rob. Great explanation and thanks to all who have responded.
Have a Nice Day ! Bob Pelletier Connecticut Student Loan Foundation Rocky Hill, Ct. -----Original Message----- From: Rob Scott [mailto:[EMAIL PROTECTED] Sent: Monday, March 05, 2007 11:03 AM To: [email protected] Subject: Re: ILR006E COMMON PAGE DATA SET FULL, OVERFLOWING TO PLPA DATA SET Bob, The system will continue quite happily (unless you discount : possible performance problems, the fact that all page I/O is going to the same device, single point of failure..etc etc) until the first ASM threshold is met (default of 70% aux storage slots in use) - after this it issues the warning message IRA200E and the system prevents new address space creation until the shortage is relieved. If you meet the next ASM threashold (85% by default), you get IEA201E which is basically saying "why haven't you sorted out the problem I warned you about with IRA200E?". >Is it better to have 10 small page datasets or 3 large datasets each scenario using the same amount of DASD space? The answer is it is better to have 10 *large* local datasets (plus a couple of spares for emergency PAGEADDs). Think of space allocation of page datasets to be in units of "entire packs" rather than cylinders. Once the normal workload is running, check the usage and try to keep local page datasets below 30% - this improves the ASM I/O operations and allows a surprise "big" job or two to want a greedy amount of nonVIO from time to time without dimming the lights. There is some really good help in Chapter 2 of the "z/OS Init and Tuning Guide" Rob Scott Rocket Software, Inc 275 Grove Street Newton, MA 02466 617-614-2305 [EMAIL PROTECTED] http://www.rs.com/portfolio/mxi_g2 -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Robert Pelletier Sent: 05 March 2007 10:46 To: [email protected] Subject: Re: ILR006E COMMON PAGE DATA SET FULL, OVERFLOWING TO PLPA DATA SET Question. If 5 small page datasets are at 100% and one large one is at 27% will the system hang or will it process until the 27% one is full? Is it better to have 10 small page datasets or 3 large datasets each scenario using the same amount of DASD space? Thanks all. Have a Nice Day ! Bob Pelletier Connecticut Student Loan Foundation Rocky Hill, Ct. -----Original Message----- From: Glenn Siegel [mailto:[EMAIL PROTECTED] Sent: Sunday, March 04, 2007 9:17 AM To: [email protected] Subject: Re: ILR006E COMMON PAGE DATA SET FULL, OVERFLOWING TO PLPA DATA SET PAGE dataset fill up uniformly, if you have 3 page dataset, two(2) of them 250 cylinders and one(1) of them 1000 cylinders and there is 750 cylinders of page space needed for paging the two(2) 250 ones will be at 100% and the one(1) 1000 one will be at 25%. My guess is the 100% used page datset are to small. Create 2 or 3, 3000 cylinder PAGE datasets and one 200 cylinder COMMON. Either use the PAGEADD and PAGEDELETE commands on the locals or change IEASYSxx and IPL. ---------------------------------------------------------------------- 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
