APC AP9606 Specifications download pdf (Page 41)

Chapter 3. UPS configurations for cluster 33

3.2.1 Control flow in UPS.CMD

In the event of a UPS power loss, a delay (UPS On Battery Delay) is set. After

this delay, the UPS service starts the UPS.CMD command file with the parameter

SingleUPSOnBattery.

The main task of the command file UPS.CMD is to call CLUSTER.EXE. This is a

Microsoft Cluster Server utility program installed during cluster setup that can be

used to administer clusters from the command prompt. The CLUSTER.EXE

parameters are described in the Microsoft Cluster Server Administrator’s Guide.

We use this utility for two purposes:

• The local cluster node is set to Paused. (The other node is also paused

because the same script is running there.) Pausing a node means that existing

groups and resources stay online, but groups and resources cannot be

brought online on this node. In this way, we ensure that a resource brought

offline will not be restarted for any reason. Also the cluster node status

PAUSED is an indicator for administrators that the command file takes control.

• Groups that are currently located on this node are brought offline. Again, the

same script is running on the other node and all resources (except quorum

disk and Cluster Group) are handled. The quorum disk cannot be brought

offline. The Cluster Group contains the cluster name and the IP address that

must remain available for executing CLUSTER.EXE commands.

Details of the command file UPS.CMD are discussed in Chapter 4, “The

command file UPS.CMD” on page 67.

Finally the OS will be shut down. After the period specified in UPS Turn Off Delay,

the servers will be powered off.

Figure 22. Single UPS flow chart

set cluster groups

to OFFLINE

UPS on battery

abnormal condition

On Battery Delay

in PC+

run UPC.CMD

SingleUPSOnBattery

set local node to

PAUSED

shutdown

Windows NT 4.0

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APC AP9606 Specifications Page 41