IBM DS4700 - One DS4700 Express and Two Storage Expansion Enclosure - Not Recommended Cabling; One DS4700 Express and Two Storage Expansion Enclosure - Recommended Cabling

redundant drive channel pair.
As Figure 53 shows, when you connect additional storage expansion enclosures,
you can connect them by using the additional port of the drive channel.
Left ESM
Left ESM
Right ESM
Right ESM
Controller A
Controller B
1
2
2
1
ds470044
Figure 52. One DS4700 Express and two storage expansion enclosure — Not recommended
cabling
Left ESM
Left ESM
Right ESM
Right ESM
Controller A
Controller B
1
2
2
1
ds470045
Figure 53. One DS4700 Express and two storage expansion enclosure — Recommended
cabling
Chapter 3. Cabling the storage subsystem 73