IBM System Storage DS3500 Introduction And Implementation Manual page 139

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Figure 4-25 Two hosts connected to a single controller DS3500 using single SAS host adapters
Figure 4-26 on page 116 shows a configuration with two hosts connected using redundant
SAS connections to a dual controller DS3500 storage subsystem. This is a good
configuration because it has redundant paths to redundant controllers.
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Chapter 4. IBM System Storage DS3500 and EXP3500 Cabling