Cabling of redundant AC-power switch (example)

You must properly cable the redundant AC-power switch units in your environment.

Figure 1 shows an example of the main wiring connections for a SAN Volume Controller clustered system with the redundant AC-power switch feature. This example is designed to clearly show the cable connections; the components are not positioned as they would be in a rack. Figure 2 shows a typical rack installation. The four-node clustered system consists of two I/O groups:

I/O group 0 contains nodes A and B
I/O group 1 contains nodes C and D

Figure 1. A four-node SAN Volume Controller system with the redundant AC-power switch feature

This figure provides an example of the cabling of a four-node SAN Volume Controller system with the redundant ac power switch feature

1 I/O group 0
2 SAN Volume Controller node A
3 2145 UPS-1U A
4 SAN Volume Controller node B
5 2145 UPS-1U B
6 I/O group 1
7 SAN Volume Controller node C
8 2145 UPS-1U C
9 SAN Volume Controller node D
10 2145 UPS-1U D
11 Redundant AC-power switch 1
12 Redundant AC-power switch 2
13 Site PDU X (C13 outlets)
14 Site PDU Y (C13 outlets)

The site PDUs X and Y ( 13 and 14 ) are powered from two independent power sources.

In this example, only two redundant AC-power switch units are used, and each power switch powers one node in each I/O group. However, for maximum redundancy, use one redundant AC-power switch to power each node in the system.

Some SAN Volume Controller node types have two power supply units. Both power supplies must be connected to the same 2145 UPS-1U, as shown by node A and node B. The SAN Volume Controller 2145-CG8 is an example of a node that has two power supplies.

Figure 2 shows an 8 node cluster, with one redundant ac-power switch per node installed in a rack using best location practices, the cables between the components are shown.

Figure 2. Rack cabling example.