2
Using the DS-DWZZH-05 UltraSCSI Hub in a Cluster Configuration
2.1 DS-DWZZH-05 UltraSCSI Hub Description
The DS-DWZZH-05 UltraSCSI hub is supported on TruCluster Available Server Software Version 1.4A and TruCluster Available Server Software Version 1.5 and TruCluster Production Server Software Version 1.4A and TruCluster Production Server Software Version 1.5.
The DS-DWZZH-05:
·Is a 5.25-inch StorageWorks Building Block (SBB)
·Has five VHDCI differential SCSI bus connectors
·Uses SCSI ID 7 whether or not fair arbitration mode is enabled. Therefore, you cannot use SCSI ID 7 for a RAID array controller or for the member systems' SCSI bus adapter.
·Contains internal termination for each port; therefore, it terminates the hub end of each SCSI bus segment.
_____________________ Note _____________________
Do not put trilinks on the DS-DWZZH-05 as it is not possible to remove the DS-DWZZH-05 internal termination.
·Requires that termination power (termpwr) be provided by the SCSI bus host adapters on each SCSI bus segment.
_____________________ Note _____________________
The DS-DWZZH-05 is designed to sense loss of termination power (such as a cable pull or termpwr not enabled on the host adapter) and shut down the applicable port to prevent corrupted signals on the remaining SCSI bus segments.
2.2 DS-DWZZH-05 Configuration Guidelines
The DS-DWZZH-05 UltraSCSI hub can be installed in:
Using the DS-DWZZH-05 UltraSCSI Hub in a Cluster Configuration 2–1
