Security Command R500 Specifications Page 345

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Manually Failing Over a Redundant Server System
PlantScape Server and Client Configuration Guide 327
Manually Failing Over a Redundant Server System
There might be times when you want the backup server to run as the primary for
a while. For instance, you may want to upgrade your primary server in some way
(for example, upgrade memory, upgrade the hard disk or install a Windows
Service Pack).
PlantScape supports manual (operator-controlled) failover from the primary
server to the backup server. This failover causes the backup server to run as the
primary.
To manually fail over:
1
Open the Server Redundancy Status display
2
Click Manual Failover. This notifies the backup server that it is to run as the
primary.
Note If the primary servers services are manually stopped, operator
intervention is required for Station to connect to the backup server.
Caution
If you manually fail over your PlantScape system the primary
and backup servers lose synchronization. The servers need to be
resynchronized if they are to run in redundant mode again.
The automatic transfer of database updates from the primary
server to the backup server does not occur until the two servers
have been synchronized.
When you want to fail back to your primary server after a
failover, you must first resynchronize your servers. If you do not
resynchronize them you lose changes to the PlantScape database
that were made while the backup server was running as the
primary.
Stopping PlantScape on your primary server also causes your
system to fail over to the backup server. If you do not want this
to happen, you should always stop your backup server before
stopping your primary server.
plscpcg.book Page 327 Monday, May 28, 2001 10:11 AM
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