IBM manual One DS4700 Express and one storage expansion enclosure

Table 24. DS4700 Express Storage Subsystem (Model 72) host ports and drive channels (continued)

Number

3

4

5

6

7

8

Description

Drive Channel 1 - Port 2 on Controller A

Drive Channel 2 - Port 2 on Controller B

Drive Channel 1 - Port 1 on Controller A

Drive Channel 2 - Port 1 on Controller B

Host Port 4

Host Port 3

Host Port 2

Host Port 1

One DS4700 Express and one storage expansion enclosure

If you are cabling one DS4700 Express Storage Subsystem to one storage expansion enclosure, Figure 51 shows the recommended cabling topology.

Note: Figure 51 illustrates the drive channel connections between the DS4700 Express and the storage expansion enclosures. Do not use Figure 51 as the cabling diagram. Follow the instructions in “DS4700 Express Storage Subsystem and supported storage expansion enclosure drive cabling schemes” on page 77 for specific cabling instructions.

2 1

Controller A

1 2

Controller B

Left ESM

Right ESM

ds470043

Figure 51. One DS4700 Express and one storage expansion enclosure — Recommended cabling

One DS4700 Express and two storage expansion enclosures

If you are cabling one DS4700 Express Storage Subsystem and two storage expansion enclosures, Connect one storage expansion enclosure per controller drive port as shown in Figure 52 on page 73. Figure 53 on page 73 shows that you can also connect two expansion enclosures together behind a single controller drive port. Although this is technically correct, use the topology as shown in Figure 52 on page 73.

As Figure 52 on page 73 shows, when you connect additional storage expansion enclosures, you can connect them by continuing the connection from the existing

72IBM System Storage DS4700 Express Storage Subsystem: Installation, User’s and Maintenance Guide