During NIP and before COMMNDxx is processed Known as DASD "Pathing" phases:
1- Path testing 2- Read device characters 3- Self Describing product --> Msg IOS291I 4- Volser processing --> This is the phase were duplicates are found. Execution of COMMNDxx happens during Master Scheduler Initialization phase of IPL "Last Phase". Thanks ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN