American Dynamics VideoEdge User Manual download pdf (Page 228)

NVR Failover

212 VideoEdge NVR 4.4 Installation and User Manual

Failover monitoring resumes only after the damaged primary NVR is repaired or replaced, and the

secondary NVR is returned to normal monitoring operation. Failover must be terminated manually

using the secondary NVR’s Administration Interface to return it to normal monitoring operation

Note

1 The secondary NVR is intended to act as a redundant standby for the NVRs it monitors. The

secondary NVR is not intended to manage cameras on its own, because these cameras would

no longer be accessible when the secondary NVR takes over for a failed primary NVR. Any

camera configuration changes you have made whilst the secondary NVR has taken over the

primary NVR’s services will be lost when failover is terminated. Camera configuration is not

synced back from the secondary NVR to primary NVR.

2 During Failover the archiving configuration on the primary NVR will not be assumed by the

secondary NVR. Media recorded to a secondary NVR can be archived if you configure

archiving on the secondary NVR.

How Failover is Initiated

When Failover is configured the secondary NVR polls the primary NVR at the configured polling

interval over the camera network. There are three possible responses from the primary NVR:

• The secondary NVR does not receive a reply from the NVR. This could

occur due to a power

failure, issues with the NVR hardware, loss of connection with the camera network and so on. In

this instance the secondary NVR sends a video stream status request to the primary NVR over

the admin network. If the primary NVR replies that there are no video streams recording when

one or more streams should be recorded at the time of the request, the secondary NVR will mark

this as a ‘failure’. The secondary NVR will repeat the polling process until the retry count is

exceeded. If the secondary NVR continues to receive a ‘failure’ from the primary NVR, Failover

will be initiated.

• The secondary NVR receives a ‘failure’ from the pr

imary NVR. This could occur due to operator

action, for example if the primary NVR services are stopped. In this instance the secondary NVR

will attempt to poll the primary NVR again (the number of polling attempts is determined by the

retry count, for further information refer to Failover Advanced Configuration). Should the

secondary NVR continue to receive a ‘failure’

from the primary NVR, Failover will be initiated.

• The secondary NVR receives a ‘good’ reply from the pri

mary NVR. In this instance a no Failover

action is taken.

Alerts

Alerts are sent to victor unified client by the secondary NVRs when the following occur:

• The secondary NVR detects the primary NVR has failed and is assuming the primary NVR’s

le.

• You terminate Failover mode after the primary NVR is operational again.

If Failover email alerts have been enabled,

the following notifications will be sent on a Failover

event:

• The secondary NVR will send an email notification s

tating “Activating Failover Mode for NVR at

primary-IP-address”

• The primary NVR will send an email notific

ation stating “Primary NVR transitioning to standby

state”

If Failover and Reboot notification

email alerts have been enabled, the following notifications will

be sent on a Failover event:

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