APC AP9606 Specifications download pdf (Page 80)

72 Implementing UPS Configurations with Microsoft Cluster Server

A parameter value SingleUPSOnBattery means a configuration with one UPS.

This is explained below. The parameter value UPSOnBattery in the case of two

UPS units was discussed in 4.2, “Parameter UPSOnBattery” on page 68.

If the condition in line 59 is fulfilled, then there is one UPS. The code for this case

begins on line 107:

107 IF %1 == SingleUPSOnBattery GOTO SingleUPSOnBattery

As the first step, the node that runs the command file enters the Node Paused

status (line 110):

110 CLUSTER . NODE %COMPUTERNAME% /PAUSE

As the second step, all groups are brought offline (jump to label GroupOffline):

112 GOTO GroupOffline

The actions to bring the resource groups offline are the same as described in

4.2.2, “GroupOffline” on page 70.

4.4 StartUp Parameter

In the StartUp section, actions can be defined that have to be performed after the

power is reestablished and the system is restarted. PowerChute PLUS generates

a PowerChute PLUS Started event. You may configure the event action to launch

UPS.CMD with the StartUp parameter.

However, we don’t recommend automatic recovery after a power failure for

several reasons:

• In a data center, a lot of services relay on each other. For example, connection

to a domain controller is needed to start the cluster service. This requires not

only a PDC or BDC, but also stable network connections. Therefore, an

administrator intervention is useful to analyze the status of such components

before starting production systems.

• There is a possibility that a resource operation might be aborted by an

operating system shutdown. According to Microsoft, resource operations are

not atomic (

Windows NT 4.0 Enterprise Edition, Release Notes

). In case of an

aborted operation, you cannot accurately predict the status of all resources at

the moment of restart.

• With Windows 2000, the power management differs from Windows NT 4.0. At

the end of an operating system shutdown, the machine is powered off

automatically. When power is reestablished, the server must be switched on

by pressing the power button.

Thus we don’t discuss further details here.

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APC AP9606 Specifications Page 80