Specifications

56 Implementing UPS Configurations with Microsoft Cluster Server

Figure 54. Double UPS flowchart

The flowchart shown in Figure 54 has three branches. The UPS On Battery

condition is signaled by the UPS. PowerChute PLUS recognizes this condition

and starts the UPS.CMD command file with the parameter UPSOnBattery. The

command file sets the node status to Node Paused. Then a branch block contains

three queries with a delay between them. If any query delivers the result that the

remote node is not Node Up, then it is impossible to move any resource to the

remote node. Therefore all groups will be set to offline except quorum disk and

Cluster Group. If both queries deliver the result that the remote node is Node Up,

then all resources will be moved to the remote node including quorum disk and

Cluster Group. After either setting the resources offline or moving them to the

remote node, the operating system shuts down.

The delay is implemented to ensure that if both systems start the script at exactly

the same time, the state of the other node is detected correctly during the second

query.

The operating system shutdown is started from the command file, not by using

the PowerChute PLUS Shut Down Server action. When using this action, the

server would be stopped after a maximum delay of 300 seconds. Since the time

necessary to take a resource offline or move a resource varies, 300 seconds

might be too short. Therefore, the script uses the SHUTGUI.EXE tool from the

Microsoft Windows NT Resource Kit CD.

UPS On Battery abnormal

condition

On Battery Delay in PC+

run UPC.CMD UPSOnBattery

set local node to PAUSED

Delay

move Cluster Groups

shut down Windows NT 4.0

yes

set Cluster Groups to offline

if remote

node "Up"

if remote

node "Up"