I am posting to the list, while I go search IBM for the cause and/or answer, in case someone has the answer already. Upgraded to z/OS V1.11 on new 2098- K02, with new IBM DS6800 dasd array. Have been testing on Test LPAR since May. Night of actual cutover to new machine, did IPL, started everything and it all went mostly well (will not discuss testing protocol here). Did IPL Saturday night and things have been hosed up since. Lots of wierd little problems, all related to datasets on disk. Got called tonight, apps group unable to resolve issue. I start looking and find one of my production volumes online. Only problem, I find the Test LPAR version of this same volume online too. They have the same volser. I have been back through the log, looking at all of the IPL messages, nothing related to duplicate volser (which I am used to). Thanks in advance for your help. Steve
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