Adaptec 412R User Guide - Page 111
A-6, A-7
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Theory of Controller Operation Figure A-6 and Figure A-7 illustrate the logical function of the controllers when both are active and then again when one controller has failed. Host I/O Host System #1 or Host System #2 HBA#2 Host System #1 HBA#1 Termination Termination Host I/O Termination Termination Termination Figure A-6 Active-Active, Single-Port Mode, Both Controllers Active Host System #1 or Host System #2 HBA#2 Host System #1 HBA#1 Host I/O Termination Termination Host I/O Termination Termination Termination Figure A-7 Active-Active, Single-Port Mode, Controller 1 Failed In the failed-over condition, the active controller will present its native identity on one host port, and the failed-over controller's identity on its other host port. After the controller has failed-over, the user can replace the failed controller with a new controller, and the arrays will fail-back to the new controller without intervention. If you want to retry the failed controller, it's necessary to release the killed status that the A-9