The Video Insight Server can write to a single drive, multiple drives, or each camera can be pointed to a unique drive. The Server creates a folder structure that is organized by IP address and date and time. By default, the Server will use all available storage in the designated path and overwrite the oldest video when necessary.
The amount of storage is determined by the bitrate of each camera and how much of that will need to be saved. For example, a 1.3 Megapixel camera set at 10 FPS can be configured to stream video at 1.5 Mbits/sec and if the camera is recording motion at 50% of the time, then we can estimate we need 7 GB of storage per day. Click here for the VI storage calculator.
Video Insight supports all storage that Windows can address. In addition to the size of the storage, it's necessary to confirm the storage system can handle the amount of video — otherwise video can be lost when the storage is overloaded. To calculate the maximum storage throughput we must assume all cameras will write simultaneously and add up all camera bit-rates. Since most storage systems refer to their maximum simultaneous write speeds in Mbytes, divide the total camera traffic by 8 to convert it to MB. For example, let's assume you have 100 cameras that will stream at 3Mbits/sec or a total of 300Mbits and we expect them to record 50% of the time. The storage system must be able to write 37.5 MB/sec at its maximum. Video Insight has developed a storage speed test to confirm your systems capability. Click here for the VI Hard Drive Speed Test.
Types of Drives
Hard drive manufacturers offer a wide variety of drives, offering different speeds and MTBF rates. When selecting drives, consider that video surveillance applications write data continuously but have far fewer read requests. This differs from typical file server operations where the hard drive is reading and writing simultaneously.
To provide the maximum protection to your data, we recommend using RAID5 with a designated Hot Spare. RAID5 allows for a single drive to fail without data loss and by designating a Hot Spare, the system will automatically rebuild the RAID on failure. Ensure your RAID card can handle the camera’s traffic as described above and for larger deployments, hardware based RAID with onboard cache is preferred.
The Video Insight Server supports all Windows addressable storage. Current customers are using storage solutions from Dell, EMC, HP, Isilon, and others.