I don't believe that MIDAW is a charged feature on IBM DASD. Health check IOS_MIDAW flags 'off' as a low exception. The other features may be a different matter.
. . JO.Skip Robinson SCE Infrastructure Technology Services Electric Dragon Team Paddler SHARE MVS Program Co-Manager 626-302-7535 Office 323-715-0595 Mobile [email protected] From: Mark Zelden <[email protected]> To: [email protected] Date: 06/22/2012 08:27 AM Subject: Re: Have you enabled MIDAW and zHPF? If not, why not? Sent by: IBM Mainframe Discussion List <[email protected]> On Fri, 22 Jun 2012 09:47:32 -0500, Thomas Conley <[email protected]> wrote: >I'd like to take a private survey to determine which sites have enabled both MIDAW and zHPF, or if you haven't enabled either or both, why. It's come to my attention that some sites may not have enabled these options. In the case of MIDAW, you have to take action to place MIDAW=NO into IECIOSxx, but for zHPF, you have to turn it on with ZHPF=YES in IECIOSxx. Both options can significantly lower your I/O overhead and increase throughput, and I haven't come up with a reason for not enabling them. > >Please respond to me privately off-list. I will keep your information confidential. I am thinking about presenting a recommedation to turn on both options for the Bit Bucket at SHARE in Anaheim. > I think you should include HYPERPAV in that same survey. I think the reason you will find people don't have zHPF and/or HIPERPAV active is they are not free HW features. I don't know if the vendors charge for MIDAW or not, or if it just takes the proper HW / code levels to support it. -- Mark Zelden - Zelden Consulting Services - z/OS, OS/390 and MVS mailto:[email protected] Mark's MVS Utilities: http://www.mzelden.com/mvsutil.html Systems Programming expert at http://expertanswercenter.techtarget.com/ ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
