Specifications

28 Implementing UPS Configurations with Microsoft Cluster Server
3.1.1 Timing of UPS actions
Figure 19 shows the timing of UPS actions.
Figure 19. Timing of UPS actions
1. When the UPS detects a power line failure, the signal UPSOnBattery is sent
via signaling cables (or network) to the servers.
2. All further actions are delayed as defined by the UPS On Battery Delay. This
delay filters short power outages so they do not shut down the server. We
decided for a delay of 5 seconds to allow enough time for shutdown, but a
longer delay may be useful in case of an accidental power plug removal of the
UPS.
3. After the UPS On Battery Delay, actions defined in PowerChute PLUS for this
event are performed. In our solution, the only action is to run the command file
UPS.CMD.
a. This command file analyzes the situation and handles cluster resources.
The time of 300 seconds shown in Figure 19 means the time necessary to
move or bring offline all application-related resources in the cluster (thus
300 seconds are an example only).
b. After resource handling is completed, shutdown of the operating system is
initiated by executing SHUTGUI.EXE.
U P S T u r n O f f D e l a y m a x . 6 0 0 s
UPS On Battery Delay (5 sec)
Power loss / Signal UPSOnBattery
Run command file UPS.CMD
Move resources or set offline (approx. 300
sec)
Begin Windows NT shutdown
Execute SHUTGUI.EXE
Wait 120 sec
W indows NT shutdown finished
Power restore
W indows NT shutdown (approx. 90 sec)
Reserved (approx. 90 sec)
UPS wakeup phase
Provide power to UPS outlets
Windows NT boot (cluster resources
offline)
UPS powers off the power outlets
UPS in sleep mode
t