Yes, with only 8GB real, setting MAXSPACE to 8GB could cause problems, or a system outage. This is not an IBM recommendation, but in Poughkeepsie System Test, we've settled on 50% of real for small images (6 GB or less), 40% for 6 - 10 GB, and 30% for images greater than 10 GB. I'm not sure offhand if there's a way to determine how much space you need. You could alternate between taking dumps and raising the MAXSPACE until you get a full dump, or you hit some limit. Again, this is not an IBM recommendation, but I'd be reluctant to go above 6GB at most for MAXSPACE. I wouldn't leave it so large after you have the dump. We have taken systems down in the past by having MAXSPACE set too high. --- Kevin McKenzie
External Phone: 845-435-8282, Tie-line: 8-295-8282 z/OS BCP SVT, Dept FXKA, Bldg 706/2D38 Lizette Koehler <[email protected]> Sent by: IBM Mainframe Discussion List <[email protected]> 04/07/2009 03:10 PM Please respond to IBM Mainframe Discussion List <[email protected]> To [email protected] cc Subject MaxSpace and Real Memory I am currently working with our DB2 group on a problem that requires an SVC dump. IBM is asking for us to set maxspace to 8g. I only have 8g real memory on this lpar. We currently have maxspace set to 2.5G. What would be my impact if I set the maxspace to 8G on an LPAR with only 8G real memory. Will that cause me any problems or overhead? How can I calculate what I will really need for this DB2 system to dump? Lizette ---------------------------------------------------------------------- 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
