We are DASD rich and CYCLEs poor, therefore NOCOMPaction anything... John Donnelly National Semiconductor Corporation 2900 Semiconductor Drive Santa Clara, CA 95051
408-721-5640 408-470-8364 Cell [email protected] -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of O'Brien, David W. (NIH/CIT) [C] Sent: Wednesday, March 23, 2011 5:46 AM To: [email protected] Subject: HSM Compaction question(s) The system I inherited has compaction turned on for Dasdmigrate and Dasdbackup. We notice spikes in CPU utilization during HSM Migration whether it is manual or interval. Since we have DASD in abundance while CPU cycles are sometimes in short supply, I'm considering turning off compaction to save on overhead. My question to the group is whether the HSM users out there have compaction turned on or not and if yes what is your COMPACTPERCENT setting? Does anyone know of any downsides to turning off compaction, other than a larger ML1 pool? David O'Brien NIH Contractor ---------------------------------------------------------------------- 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
