Vivotek NR9682-v2 64-Channel NVR (No HDD) - Manual (Page 183)

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User's Manual - 183
In terms of network failure, the VAST2 configuration supports Seamless Recording. For cameras
equipped with an SD card, video is recorded to the SD cards in the event of network failure. Of
course, the cameras must have a backup power source, such as a DC 12V input. In cases such
as the only PoE switch or PoE mid-span fails, power is lost.
Active VAST servers Redundant VAST servers
CMS VAST
Active Group Redundant Group
Node 1
Node 2
Node 1
Node 2
Node 3
External storage /
NAS Network Cameras
. . . . .
Server Group 1
Network
Failure
Recording
CMS Failover
LAN
Once the network connection is restored, the VAST2 servers resume the recording task and also
retrieve video segments from the SD cards. The video segments recorded during the network
failure will be stitched up with those occurred before and after the network failure. The retrieval
speed varies depending on the available network bandwidth and CPU resources.
Active VAST servers Redundant VAST servers
CMS VAST
Active Group Redundant Group
Node 1
Node 2
Node 1
Node 2
Node 3
External storage /
NAS Network Cameras
. . . . .
Server Group 1
Recording
Retrieval
LAN
Recovered!
CMS Failover