Adaptec 412R User Guide - Page 125
A-16, illustrate the active-passive mode
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Theory of Controller Operation CH 1 CH 2 CH 0 CH 3 Figure A-16 and Figure A-17 illustrate the active-passive mode logical functions when the controllers are operating in a normal condition and then in a failed condition. Controller FC Host Ports HOST I/O RAID Controller P1 FC1 Active Disk CH1 HUB P2 HUB FC2 Active Disk CH2 Disk CH0 P4 Disk CH3 P3 Controller 1 ACTIVE Drives 7 - 12 Drives 1 - 6 Drive I/O Connectors T SEP T SEP SAF-TE Disk I/O T T Host I/O Connectors RAID Controller FC1 Passive Disk T CH1 Disk I/O FC2 Passive Disk CH2 T Disk T CH0 T= Location of internal termination Disk CH3 Controller 2 PASSIVE T Controller Disk Ports Figure A-16 Active-Passive Dual-Port, Hubs Enabled, Controller 1 Active Controller FC Host Ports HOST I/O RAID Controller P1 FC1 Inactive Disk CH1 HUB P2 HUB FC2 Inactive Disk CH2 Disk CH0 P4 Disk CH3 P3 Controller 1 FAILED RAID Controller Host I/O Connectors FC1 Active Disk T CH1 Drives 7 - 12 Drives 1 - 6 Drive I/O Connectors T SEP T SEP SAF-TE Disk I/O T T SCSI I/O FC2 Active Disk CH2 T Disk T CH0 T= Location of internal termination Disk CH3 Controller 2 ACTIVE (FAILED OVER) T Controller Disk Ports Figure A-17 Active-Passive Dual-Port, Hubs Enabled, Controller 1 Failed CH 1 CH 2 CH 0 CH 3 A-23