EVT Tech Tips

Storage Devices

Many RAID Array storage manufactures claim that the read & write speed of their Raid Arrays can support more than 100 Mbps data traffic. Raid Arrays performance specifications are based on inconsistent data flow of a small number of files at any given time. When recording Video data, the number of files written simultaneously to the storage device is typically high, one file per recorded camera channel, and the data traffic flow is consistent.

For example, streaming one camera channel at 4CIF resolution, 25fps will require 2-4Mbps data stream depending on the compression algorithm, the quantization settings and obviously the complexity of the camera’s captured image as well as the level and frequency of changes in the image. Most SCSI RAID arrays will support data traffic of up to 100Mbps. Therefore, it would be safe to assume that one Raid Array can handle recording of 25-28 camera channels streaming at 4CIF resolution, 25fps.

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