> -----Original Message----- > From: IBM Mainframe Discussion List > [mailto:[email protected]] On Behalf Of Gibney, Dave > Sent: Friday, August 07, 2009 1:12 PM > To: [email protected] > Subject: Re: DASD: to share or not to share > > > -----Original Message----- > > From: IBM Mainframe Discussion List [mailto:[email protected]] On > > Behalf Of Scott Rowe > > Sent: Friday, August 07, 2009 8:51 AM > > To: [email protected] > > Subject: Re: DASD: to share or not to share > > > > Heck, I just use a CF partition running on my shared CP. As long as > you > > I've heard lots of scary stories about sharing CPs for CF. I > understood > the CF code was basically a non-terminating loop.
The normal way that the CF code works is what is called an "active wait". Basically, it soaks 100% of the CPU because it is polling the interface, rather than waiting for an interrupt. However, there is a command that you can issue to the LPAR running the code which is, IIRC, "DYNDISP ON" which changes from polling to "interrupt mode". This reduces the CPU requirement, but slows the response time down. > > I've even heard of folks using a CF lpar as a MSU soaker to keep z/OS > MSU's down for SCRT purposes. It's easier to use GROUP CAPACITY for this on the z9+ and z/OS 1.8+. We are doing it. > > I certainly don't want any hang of my production system > because I shared > with a CF. Me neither. > -- John McKown Systems Engineer IV IT Administrative Services Group HealthMarkets(r) 9151 Boulevard 26 * N. Richland Hills * TX 76010 (817) 255-3225 phone * (817)-961-6183 cell [email protected] * www.HealthMarkets.com Confidentiality Notice: This e-mail message may contain confidential or proprietary information. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. HealthMarkets(r) is the brand name for products underwritten and issued by the insurance subsidiaries of HealthMarkets, Inc. -The Chesapeake Life Insurance Company(r), Mid-West National Life Insurance Company of TennesseeSM and The MEGA Life and Health Insurance Company.SM ---------------------------------------------------------------------- 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
