Security Command R500 Spécifications Page 344

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14 – Configuring and Monitoring a Redundant Server System
326 R400
Failover of a Redundant Server System
The backup server takes over from the primary if:
The primary server hardware fails and the backup cannot communicate with
it
All network links between the primary and backup server are broken
The primary loses C200 communications because of a non-recoverable
failure in its C200 communications subsystem
A user does a manual failover (see “Manually Failing Over a Redundant
Server System” on page 327)
The primary server can be configured to restart (with the backup server
becoming primary) if one of the following tasks fails:
timer (controls timing of all PlantScape Server tasks)
scanx (controls the SCADA scanning subsystem)
daqmgr (controls the delivery of SCADA acquisition requests to the
appropriate SCADA driver)
The backup server does not take over from the primary if a SCADA channel fails.
plscpcg.book Page 326 Monday, May 28, 2001 10:11 AM
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