Jack, Are you at the current release level (r12)? There was maintenance applied to reduce CPU usage for normal (non-compression) usage. If you use compression (to help reduce the amount of cache used), that does use CPU. Of course, the compression CPU usage can be offloaded to a zIIP if you have one available.
-----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]]on Behalf Of John Kelly Sent: Friday, April 17, 2009 2:25 PM To: [email protected] Subject: Re: TMM with CA-1 and STK Silo <snip> Of course you can have a full-functional "virtual tape" solution without the hardware, its called CA-Vtape ;} <unsnip> Since Russell brought it up, I'd like to inquire if users have measured how much CA Vtape cost in cycles. Although we're a small uniprocessor when Vtape activity gets going (activity rate is in the low 100/sec) , we lose about 25% of our processor to Vtape. Is that the kind of numbers that others are seeing? I know YMMV but just fishing for some comparisons. Jack Kelly 202-502-2390 (Office) ---------------------------------------------------------------------- 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
