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Automatic Camera Failover

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Affected Roles: System Owner • System Administrator 
Related DW Spectrum VMS Apps: DW Spectrum Desktop 
Complexity: Medium
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What is Automatic Camera Failover?

Automatic Camera Failover is a feature in DW Spectrum which allows System Servers to automatically recover when a power or networking failure occurs on a Server. Automatic Camera Failover can be enabled on individual Servers. When enabled Failover tells the server to grab cameras from any failed Server in the System.

A single Server can handle a maximum of 128 cameras. So, for example, if a Server is actively recording 64 cameras it can act as a Failover Server for up to 64 additional cameras from other Servers in the System. 

Failover takes approximately 1 minute in the instance of a network or power failure.

Failover Design considerations

DW Spectrum’s server-hive architecture is flexible enough to implement Failover in a variety of methods. When designing and implementing a DW Spectrum with Failover some careful consideration should be given to the systems design. A DW Spectrum with Failover can be designed using the Standby Method or the Overhead Method.

So assume an application has 140 cameras of relatively equal resolution.

Standby Method - 2 servers are in production mode each recording 70 cameras and a 3rd server is merged into the system with no cameras on it. In this case if any of the 2 servers goes offline the 3rd server can take its place.

Overhead Method - 3 servers are in production mode each recording 47 cameras in merged environment. In this case if any one of the 3 servers goes offline the overhead capacity (in processor power and storage) of the other 2 servers can grab the failed servers cameras and continue to record.

To Enable Automatic Camera Failover on a Server:

  • Right click no a server in the Resource Panel and choose Server Settings.
  • In the Server Settings dialog check Enable Failover.
  • Enter the maximum number of selected server can handle (128 Maximum on Core i3 or above CPUs, 12 maximum on ARM CPUs)
  • Click OK.
  • If you want to add additional Failover Servers in the same System repeat the steps above for each Server. 

To Setup Failover Priority:

  • While still in the Server Settings dialog Click on the Failover Priority button.
  • Assign a value of HighMedium, or Low priority to each camera.
    • Failover for System cameras will follow assigned priorities - with High priority cameras failing over first, then Medium priority, and finally Low. Failover assigns cameras to the first available Failover server recognized by the System.
  • Repeat this for all cameras that should be prioritized.

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  • 29-Mar-2019
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