Compaq ProLiant CL380 Compaq ProLiant CL380 User Guide - Page 232
Active/Passive Failover Mode (Availability), Table H-2
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SCSI ID Configurations H-9 Active/Passive Failover Mode (Availability) If the system is configured with two CR3500 Controllers, Host I/O Channel 0 is set to Active, and Host I/O Channel 1 is set to Active for Controller 1 and both are set to Passive for Controller 2, then the Failover Mode is Availability. The table below explains how the Host I/O settings determine the failover method Table H-2 Active/Passive Failover Mode Availability Active/Passive Failover Mode Host I/O Channel 0 Host I/O Channel 1 Controller 1 Availability Active (SCSI ID = 2) Active (SCSI ID = 3) Controller 2 Availability Passive (SCSI ID = 2) Passive (SCSI ID = 3) You will notice that in this configuration that although there are two instances of SCSI IDs 2 and 3, one is active and the other is passive. This prevents a SCSI ID conflict. It is not possible to configure all four Host I/O channels to be active.