MIDAWs APAR – Mixed Control Units

(Originally posted 2006-02-22.)

DFSMS APAR OA15034 documents a condition where some controllers support MIDAWs and other controllers don’t. Where a tablespace spans these two kinds of controllers this APAR is important.

MIDAWs (Modified InDirect Access Words) are a new channel programming construct on System z9-109 processors which can improve the efficiency of FICON channel programs and hence improve performance. I’ll be presenting on these at the z/OS conference in Dusseldorf 20-24 March.

Published by Martin Packer

I'm a mainframe performance guy and have been for the past 35 years. But I play with lots of other technologies as well.

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