(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.
Mainframe, Performance, Topics 