Figure 3–1 shows a VHDCI trilink connector (UltraSCSI), which you may attach to an HSZ70 or HSZ80.
Figure 3–1: VHDCI Trilink Connector (H8861-AA)
CXO5744A
3.6 UltraSCSI Hubs
The DS-DWZZH series UltraSCSI hubs are UltraSCSI signal converters that provide radial connections of differential SCSI bus adapters and RAID array controllers. Each connection forms a SCSI bus segment with SCSI bus adapters or the storage unit. The hub provides termination for one end
of the bus segment. Termination for the other end of the bus segment is provided by the:
•Installed KZPBA-CB (or KZPSA-BB) termination resistor SIPs
•External termination on a trilink connector attached to an UltraSCSI BA356 personality module (DS-BA35X-DA), HSZ70, or HSZ80
______________________ Note _______________________
The DS-DWZZH-03/05 UltraSCSI hubs cannot be connected to a StorageWorks BA35X storage shelf because the storage shelf does not provide termination power to the hub.
3.6.1 Using a DWZZH UltraSCSI Hub in a Cluster Configuration
The DS-DWZZH-03 and DS-DWZZH-05 UltraSCSI hubs are supported in a TruCluster Server cluster. They both provide radial connection of cluster member systems and storage, and are similar in the following ways:
•Contain internal termination for each port; therefore, the hub end of each SCSI bus segment is terminated.
_____________________ Note _____________________
Do not put trilinks on a DWZZH UltraSCSI hub beacuse it is not possible to remove the DWZZH internal termination.
3–8Shared SCSI Bus Requirements and Configurations Using UltraSCSI Hardware
