IBM 8408-44E Site And Hardware Planning page 150

Figure 65. SAS adapter to both a disk expansion drawer and a media expansion drawer
Note: The YO cable must be routed along the right side of the rack frame.
System external SAS port to disk expansion drawer
Figure 66 on page 135 illustrates connecting a system external SAS port to a disk expansion drawer. Disk
expansion drawers cannot be cascaded.
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Site and hardware planning