APC AP9606 Specifications download pdf (Page 40)

32 Implementing UPS Configurations with Microsoft Cluster Server

We recommend that you attach each server to one UPS and then connect each

shared storage device to both UPS units, as shown in Figure 21. In this way,

timing problems are avoided, and the configuration can easily be extended to a

solution with two separate power lines (discussed in 3.3, “Solutions with double

power lines” on page 51).

Figure 21. Single power line with two UPS units

In this paper, we restrict discussion of single power line solutions to the case with

one UPS only. With two UPS units, the only difference is that both nodes use

black smart-signaling cables. Thus both nodes would be installed identically (as

described in 3.2.4, “Installing PowerChute PLUS on the node with a black serial

cable” on page 35).

Most of the cluster-specific problems (from Chapter 1, “The problem” on page 1)

don’t really exist with this approach; the server status is always the same for both

machines because they have the same power source. For the same reason,

there are no cases to consider for server power cabling. UPS monitoring is simple

because one UPS can be monitored by more than one server. For storage

protection and power cabling, the same arguments apply.

The problem of application shutdown is solved by our command file UPS.CMD.

The command file is started by the Windows NT UPS service after a power

failure. It sets the groups offline and shuts the server down.

This configuration provides a simple solution to all major problems. The

disadvantages are a lack of power source redundancy and the need for a

sufficiently large UPS.

Cluster

UPS

Server 1

Server 2

Communication - Smart-signaling cable

UPS

Phase A

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APC AP9606 Specifications Page 40