AFAIK, the modern ROT for paging is zero. One or two per second is ok. Some argue that modern DASD will support slightly higher rates.
A demand page in is a very expensive synchronous event, burning IO, CPU, and clock time. Any page or physical swap is very expensive and s l o w. Make sure you do not have any other old superstitions that prohibit exploitations of central. Sort, for example, makes a fine business case; cut it loose. Lots of buffers and maximum block sizes will make your batch scream. Get your buffer hit rates in the high 90% range for your onlines. HTH and good luck. -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of DMR-Qualitas Outsourcing Sent: Wednesday, December 21, 2005 6:19 AM To: IBM-MAIN@BAMA.UA.EDU Subject: Rule of thumb about paging / page fault rate Good morning, we are revising central storage due to our systems not paging and, therefore, it's possible that we have installed too central storage. We have seen to find values or some rule of thumb but we don't find anything. At 1991 the recommendation was 300-500pag/sec of total paging but now this recommendation has been disappeared. Could you help us? Thanks ---------------------------------------------------------------------- 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
