Video playback test As video is being written to the storage, video is simultaneously recalled or reviewed on 12 cameras from three playback machines. The review did not affect the write rate, video quality, or result in dropped video. Disk failure test A single disk failure is the most common failure affecting storage systems today. When a disk fails, that disk is removed and replaced. The replacement disk is then reconstructed. NIC failure testIdentifies the drop-in write bandwidth and any recording failures that occur if one of the configured NICs on the storage array fails. Controller power-off testIdentifies the time that it takes for video recording to resume after a complete shutdown of a storage controller.