IBM DS4700 manual Controller B Left ESM Right ESM

redundant drive channel pair.

2	1
Controller A

1	2
Controller B

Left ESM

Right ESM

Left ESM

Right ESM

ds470044

Figure 52. One DS4700 Express and two storage expansion enclosure — Not recommended cabling

As Figure 53 shows, when you connect additional storage expansion enclosures, you can connect them by using the additional port of the drive channel.

2	1
Controller A

1	2
Controller B

Left ESM

Right ESM

Left ESM

Right ESM

ds470045

Figure 53. One DS4700 Express and two storage expansion enclosure — Recommended cabling

Chapter 3. Cabling the storage subsystem 73