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 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.

This figure provides an example of the cabling of a four-node system with the redundant AC power switch feature — Figure 1. A four-node system with the redundant AC-power switch feature

1 I/O group 0
2 Node A
3 2145 UPS-1U A
4 Node B
5 2145 UPS-1U B
6 I/O group 1
7 Node C
8 2145 UPS-1U C
9 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 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 eight node cluster, with one redundant ac-power switch per node that is installed in a rack by using best location practices. The cables between the components are shown.

Example of rack cabling — Figure 2. Rack cabling example