Tom, Quite a bit has been done with CA-Vtape since 2005 to help reduce CPU utilization. In particular CA-Vtape will exploit a zIIP (if available of course). And yes, if a zIIP is not available then compression will be done using main CPU cycles; so then you have to balance the need for a compressed CACHE versus CPU cycles. If you have a z9 with a zIIP; then you have many more options (what percentage should be done on teh zIIP versus main CPU cycles).
Rusell Witt CA L2 Support Manager -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] Behalf Of Tom Eden Sent: Monday, March 31, 2008 8:11 PM To: IBM-MAIN@BAMA.UA.EDU Subject: CA VTAPE Does anyone have comments about CA VTAPE? I did some archive searches and got some hits from 2005. I was wondering if there are any more recent experiences. I am probably most curious about CPU consumption. One of the 2005 post talked about a 15% hit on a Z890. There was a response to turn off compression for the DASD Cache. The original poster thought that they already had done so, but I did not see a follow-up post that said whether that was true or not. ---------------------------------------------------------------------- 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
