IBM TOTALSTORAGE DS4500 - Manual (Page 15)

Leave the In port on the right ESM board on the first storage expansion enclosure in storage
expansion enclosure group 2 and the Out (upper) port on drive mini hub 1 unoccupied.
Drive Loop A
Drive Loop B
Drive Loop D
Drive Loop C
Input Input Output Output
First DS4000 drive
enclosure
Last DS4000 drive
enclosure
New DS4000 drive
enclosure
DS4500 Storage
Subsystem
ESMs
First DS4000 drive
enclosure
Last DS4000 drive
enclosure
Storage Expansion
Enclosures - Group 1
Storage Expansion
Enclosures - Group 2
ds454min
Figure 16. Connecting two redundant storage expansion enclosure groups
15