Compaq AA-RHGWC-TE manual

3

Shared SCSI Bus Requirements and Configurations Using UltraSCSI Hardware

A TruCluster Server cluster uses shared SCSI buses, external storage shelves or RAID controllers, and supports disk mirroring and fast file system recovery to provide high data availability and reliability.

This chapter:

•Introduces SCSI bus configuration concepts

•Describes requirements for the shared SCSI bus

•Provides procedures for cabling TruCluster Server radial configurations using UltraSCSI hubs and:

–Dual-redundant HSZ70 or HSZ80 RAID array controllers enabled for simultaneous failover

–Dual-redundant HSZ70 or HSZ80 RAID array controllers enabled for multiple-bus failover

•Provides diagrams of TruCluster Server storage configurations using UltraSCSI hardware configured for radial connections

______________________ Note _______________________

Although the UltraSCSI BA356 might have been included in this chapter with the other UltraSCSI devices, it is not. The UltraSCSI BA356 is covered in Chapter 9 with the configurations using external termination. It cannot be cabled directly to an UltraSCSI hub because it does not provide SCSI bus termination power (termpwr).

In addition to using only supported hardware, adhering to the requirements described in this chapter will ensure that your cluster operates correctly.

Chapter 9 contains additional information about using SCSI bus signal converters, and also contains diagrams of TruCluster Server configurations using UltraSCSI and non-UltraSCSI storage shelves and RAID array controllers. The chapter also covers the older method of using external termination and covers radial configurations with the DWZZH UltraSCSI hubs and non-UltraSCSI RAID array controllers.

Shared SCSI Bus Requirements and Configurations Using UltraSCSI Hardware 3–1