Adaptec 1966600 User Guide - Page 84
Active-Active Single-Port Mode, situations where the hosts have a single Fibre Channel port, and so
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DuraStor 6220SS/7220SS Installation and User's Guide In Figure 3-45, two hosts are connected via two independent switches. Note that both hosts can still see Controller 1's LUNs (LUN 1) and Controller 2's LUNs (LUN 2); however, each host HBA can only see one LUN, instead of both. DuraStor FC RAID Appliance Host 1 Sees LUN 1 FC HBA Sees LUN 2 FC HBA Switch 1 P2 P1 Host 2 P3 FC HBA Sees LUN 1 P4 Switch 2 FC HBA Sees LUN 2 CH0 FC2 LUN 2 CH1 FC1 LUN 2 CH2 Controller 2 CH3 FC1 LUN 1 FC2 LUN 2 Controller 1 CH0 T CH1 T CH2 T CH3 T CH0 Up to 12 Disk Drives CH1 Up to 12 Disk Drives CH2 Up to 12 Disk Drives CH3 Up to 12 Disk Drives Figure 3-45 Active-Active Dual-Port Hubs Disabled, Controller 2 Failure Active-Active Single-Port Mode There are several scenarios when you may want to configure the controllers in active-active single-port mode. In general, these are situations where the hosts have a single Fibre Channel port, and so the SAN is not truly fault-tolerant. 3-50
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