When designing a video surveillance system, one of the the most important steps is determining the storage device capacity. When deploying a multiple camera system, using a network attached storage (NAS) device is a viable option as it will give you a central video storage location and protection against hardware failure through the use of multiple hard drives in a redundant array of independent disks (RAID) configuration. A critical step in selecting the right NAS device for your application is determining the amount of storage space required.
Mobotix has simplified this calculation process with the use of their Storage Requirements Planner. The Storage Planer will guide you though all of the necessary parameters of each type of camera to determine the storage requirements. Below is an example calculation for twenty D24 cameras to record on events in a high motion rate area with 14 hours of illumination per day.
As shown above the Storage Requirements Planer allows the user to select the model of Mobotix camera, the image complexity, how much motion is expected in the viewing area, as well as how the camera will be configured for resolution and video codec.
Next, the planer goes through various recording parameters such as whether the application requires continuous or event based recording. You will also select how many frames per second you wish to capture and how many events per day you anticipate. Lastly, enter how long you want recorded events to be stored on the NAS. In this example we chose to keep the recordings for 30 days.
The result of this example estimates 57.56GB of disk space is required, per camera, for the parameters shown. Therefore, the twenty camera system will require approximately 1,151.2GB (57.56GB x 20) of storage space. Assuming a RAID 5 storage configuration, the system will require three 750GB hard drives. Three 750GB drives in a RAID 5 configuration will provide approximately 1,400GB ((750GB X 3) X .62) of total usable storage space.
Now that you know the total storage requirements for the system, you can select the NAS that suits your application.
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