In Security Center, your video recordings are not stored in a database. Recordings are stored on disk, in small files with a G64 extension called video files. Each video file contains one or many short sequences of video. Similar to the archive database, the archive file storage is also specific to each server.
The location of the video files and the description of the video sequences they contain (source camera, beginning and end of sequence) are stored in the database catalog managed by the Archiver or Auxiliary Archiver. For each Archiver role, you can set the maximum size limit of the video files.
Both local drives and network drives can be used to store video. In the Archiver’s Resources tab, all local drives found on the host server are listed by default and grouped under Default Disk Group, as shown in the following image.
Archive storage requirementsBecause the Archiver role and Auxiliary Archiver role can control a different number of cameras, you must evaluate the storage requirements for each of these roles separately.
- The number of cameras that need archiving.
- The number of days you need to keep the archive online.
- The percentage of recording time. The percentage of recording time depends on the selected archiving mode. You can configure your recordings for specific times during the day, and the archiving mode can be continuous, triggered by motion and user request, only upon user request, or off. Continuous recording consumes disk space faster than each of the other archiving modes.
- Frame rate. The higher the frame rate, the more storage space the recording needs.
- Image resolution. The higher the image resolution, the more storage space the recording needs. The image resolution is determined by the video data format that is being used.
- The expected percentage of movement. Instead of storing the whole image for every single frame, most video encoding schemes compress data by storing only the image changes between consecutive frames. As a result, recording a scene with plenty of movement requires more storage than recording a scene with little movement.
- Audio and metadata recordings. Audio and metadata, if recorded, can also add to the amount of storage required.