Specifications

Monitoring Redundant Servers
PlantScape Server and Client Configuration Guide 321
Monitoring Redundant Servers
Once the servers are running in redundant mode, you can use a number of
methods to monitor the status of your system.
Using Station to Monitor Redundant Servers
You can use the Server Redundancy Status display on Station to:
• Determine which server is currently running as the primary
• Determine whether the servers are synchronized
• Synchronize the servers
• Manually fail over to the backup server
• Monitor the redundancy queue availability and data transfer rates
• Change the checkpoint period
To call up the Server Redundancy Status display select View
⇒
System Status
⇒
Server Redundancy from the Station menu.
A description of some of the fields on the Server Redundancy Status display
follows:
Property Description
Queue Availability PlantScape uses a queue to buffer database information to be
sent from the primary to the backup server.
On the Server Redundancy Status display the Availability
field shows the percentage of the queue size. In the course
of normal operations, this number should be close to 100.
If the number is less than 100%, then there is currently data
in the queue that needs to be transferred to the backup
server.
Availability threshold When you specify a value in the Availability threshold field,
the system will record the amount of time that the queue
availability drops below the specified percentage
Checkpoint period The checkpoint period is the cyclic period that the contents
of the memory-resident part of the database are sent to the
backup server. The default value is 300 seconds (5 minutes).
This value is not normally changed.
Link transfer rate The Link Transfer Rate value gives a measure of the
throughput of the redundant link.
plscpcg.book Page 321 Monday, May 28, 2001 10:11 AM