IBM ServeRAID-4 Ultra160 Series User Reference page 111

The solution you use for your installation depends on your specific requirements.
For more information about requirements and types of installations, refer to the IBM
Shared Disk Clustering Hardware Reference. You can obtain this publication from
the IBM Support Web site. See "Downloadable files from the World Wide Web" on
page 131 for additional information.
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Chapter 11. Introduction to IBM ServeRAID Cluster Solution