Adaptec 1966600 User Guide - Page 55
Active-Passive Dual-Port Mode
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Installing the DuraStor Storage Subsystem Active-Passive Dual-Port Mode This operating mode provides redundancy, transparent failover and failback, and support for optional upstream failover. It is suitable when a single host computer needs access to all LUNs. However, this mode has lower performance than active-active single-port mode. It requires third-party software if upstream failover is implemented and it reports all arrays twice to the operating system, causing the potential for data overwrites. Because this operating mode does not provide any special advantages, we recommend using active-active single-port mode instead. 1 Connect the SCSI data cables as shown in Figure 3-19. HBA 2 HBA 1 (ID 7) (ID 7) Host Computer 3-meter cable 3-meter cable DuraStor SCSI RAID Appliance HOST 1 IN (CH 3) HOST 2 IN (CH 0) HOST 1 OUT HOST 2 OUT Disk CH 2 Disk CH 1 Serial B Ext Serial A Int HOST 1 IN (CH 3) HOST 2 IN (CH 0) Figure 3-19 Active-passive Dual-port Cabling Diagram Note: External terminators are required for any dual controller configuration where Host 2 In (CH 0), Host 1 In (CH 3), Disk CH 1, or Disk CH 2 are not cabled. 2 Set the host system HBAs to SCSI ID 7. Refer to your host system's user's guide for details on setting HBA SCSI IDs. 3 Power on the DuraStor External Storage Subsystem. See page 3-54. 4 Set the controller operating mode. For detailed instructions, refer to the user's guide for the storage management tool you are using. 3-21