"Large memory" is not the situation I am dealing with. It is a modern system but it is at a service bureau and there is a substantial charge associated with real memory. My management does not want to just throw money at the system; he wants some way of seeing whether real memory constraint is a problem and whether additional real memory improves the problem. "Performance" is hard to measure because the workload is extremely varied and not directly under our control, so mostly what we have is subjective: "it's really slow today."
Charles -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Scott Chapman Sent: Sunday, November 3, 2019 5:08 AM To: [email protected] Subject: Re: How display level of paging? I'm not so sure that's practical and necessary for the large memory systems that we have today. Last time I looked across a number of customers it was fairly common for LPARs with hundreds of GB of memory to have paging space < 1x memory. Sometimes much less. Those with Storage Class Memory were more likely to have paging space >= real storage. But even there, we've seen >1TB LPARs with with only a few hundred GB of paging space, including SCM. Of course it is also fairly common for those large memory systems to be running with large amounts of that memory being available. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
