Is there some indication that it will not improve performance on non-IBM DASD?
-Rob -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Bruce Black Sent: Thursday, July 13, 2006 8:21 PM To: [email protected] Subject: Re: MIDAW on non-IBM Devices > > Clark, I don't know if someone already answered (since your post is a > bit > old) but we are planing to implement MIDAW on EMC boxes. > > In the case of EMC you just need to put the Enginuity microcode > capable of supporting MIDAW. > > Have you done or heard anything about it? > Any experience? > > Basically our main concern is about mix-mode environments, since same > EMC boxes will be accessed by a mix of MIDAW and non-MIDAW z7 systems > until we roll this out across the whole plex. As I understand it, the whole issue of MIDAW support on EMC and other non-IBM boxes was a timing issue. The control unit is unaware that MIDAWs are in use, but the use of MIDAWs changed the timing of certain channel events, and EMC was not prepared to handle it until the microcode upgrade. So having MIDAWs enabled on some systems and not on others should be transparent to the box. I believe that currently the only exploiter of MIDAWs is DB2 so unless you have DB2 data in the EMCs it may not make a difference. But I also believe that on IBM equipment at least, MIDAWs make a noticeable performance improvement. -- Bruce Black Senior Software Developer Innovation Data Processing ---------------------------------------------------------------------- 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 This e-mail transmission contains information that is confidential and may be privileged. It is intended only for the addressee(s) named above. If you receive this e-mail in error, please do not read, copy or disseminate it in any manner. If you are not the intended recipient, any disclosure, copying, distribution or use of the contents of this information is prohibited. Please reply to the message immediately by informing the sender that the message was misdirected. After replying, please erase it from your computer system. Your assistance in correcting this error is appreciated. ---------------------------------------------------------------------- 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
