Server redundancy uses your computer network to detect the failure of either server and to keep the point and alarm databases synchronized. Therefore, the reliability of your network is critical to the operation of server redundancy. We highly recommend the use of a networking consultant to design and configure your network. Faulty terminations, bad cabling or improperly configured network switches will cause problems in your system. Spending the time up-front to build a reliable network with quality components (NICs, Switches, Cable, etc) will save you time in the long run. Your network must meet the following requirements:
Network must be reliable and properly configured.
Additionally, the following recommendations should be implemented.
Primary and secondary servers connected into the same intelligent network switch or hub.
Note: A large volume of network traffic occurs between the primary and secondary computers. These two computers should be plugged into a network switch that will isolate the inter-server communications from the rest of the network.
Steady-State Memory Utilization should be less than 10%.
Note: Using the Windows Performance Monitor observe, the Memory / Pages/Sec Counter. This value should be 0.
Ping times between primary and secondary servers must be less than 10ms, between viewers and servers less than 30ms.
Use equipment rated for the ambient temperature of your environment.
The servers should not use DHCP unless the leases never expire.
Additionally, the following recommendations should be implemented.
Primary and secondary servers connected into the same intelligent network switch or hub
Note: A large volume of network traffic occurs between the primary and secondary computers. These two computers should be plugged into a network switch that will isolate the inter-server communications from the rest of the network.
Consider using 100mbs Ethernet between the primary and secondary computers.
Consider isolating Server to PLC Traffic on a private network segment.
Server redundancy requires a reliable network, if network reliability is an issue you should consider implementing cabling redundancy between the servers and viewers.
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Server redundancy hardware requirements. |
