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v The DS4500 drive mini hub port must always be connected to the 10- or 14-drive
storage expansion enclosure left ESM In port of the last enclosure in the group of
enclosures that are cabled in a redundant drive loop pair. In addition, the DS4500
drive mini hub port must always be connected to the 10- or 14-drive storage
expansion enclosure right ESM Out port of the first enclosure in the group of
enclosures that are cabled in a redundant drive loop pair. Figure 54 on page 75
shows this correct cabling to the 10- or 14-drive storage expansion enclosure
ESM ports.
Storage expansion enclosure cabling diagrams
These diagrams help describe the information that is listed in “General rules and
recommendations for cabling storage expansion enclosures” on page 65.
68 IBM TotalStorage DS4500 Fibre Channel Storage Subsystem: Installation, User’s, and Maintenance Guide