David, >I always thought a null configuration was what you got if there was no IGDSMSxx >member, that's what I remember from one-pack systems but I cannot test it now. > I think that is just not running/starting SMS. Is this an option anymore? Running SMS with a null configuration is running with an empty linear vsam dataset as your ACDS. Running SMS with a minimum configuration was as Mark described it earlier. IBM initially recommended running with a null configuration if you were not going to use any of the features. That was changed to run with a minimum configuration later. I have a special SMS with minimum configuration used with our emergency two pack system. Regards, John
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