Dell PowerVault 220S (SCSI) - Manual (Page 7)

Introduction: Dell PowerVault 220S and 221S Systems User's Guide
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Split-Bus Module
Your system supports three SCSI bus modes controlled by the split-bus module:
Cluster mode
Split-bus mode
Joined-bus mode
These modes are controlled by the position of the bus configuration switch when the system is turned on. Figure 1-6
illustrates the switch position for each mode.
Figure 1-6. Bus Configuration Switch Modes