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this technical update provides the DS-DWZZH-05 configuration information
that would appear in Chapter 4 of the TruCluster Software Products
Hardware Configuration manual.
1.2 DS-DWZZH Overview
The DS-DWZZH series UltraSCSI hubs are SCSI-2 and draft SCSI-3
compliant SCSI 16-bit signal converters capable of data transfer rates of up
to 40 MB per second. Cluster member systems and HSZ50 or HSZ70 RAID
array controllers are radially connected to the hub ports.
A DS-DWZZH UltraSCSI hub:
• Improves the reliability of the detection of cable faults.
• Provides for bus isolation of cluster systems while allowing the
remaining connections to continue to operate.
• Allows for more separation of systems and storage in a cluster
configuration because each SCSI bus segment can be up to 25 meters in
length. This allows a total separation of nearly 50 meters between a
system and the storage.
For more information on the DS-DWZZH-05 UltraSCSI hub, see the
following documents:
• DWZZH 16-Bit UltraSCSI Hub User’s Guide (EK-DWZZH-UG)
• Shared Storage for DIGITAL UNIX Using UltraSCSI Hubs
(EK-SMA20-AN)
• StorageWorks Solutions BA356-SB 16-Bit Shelf User’s Guide
(EK-BA356-UG)
1–2 DS-DWZZH-05 UltraSCSI Hub