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
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