An extra-parity energy saving data layout for video surveillance

The advent of big data age has brought about a growing performance and scale of the storage system, as well as huge energy consumption. Based on the sequential data storage featured workload as video surveillance, etc., we proposed EPS-RAID, that is to add a solid state disk(SSD) and a parity disk on S-RAID, and to optimize the random reads and writes in storage system by means of random write logs and Reed-Solomon(RS) code. Preserving the grouping strategy and the local parallel strategy of S-RAID, EPS-RAID has achieved good effect for random reads and writes on standby grouping, especially for the repeated reads and writes on the same logical address. The experiments show that, in the 3 file systems of EXT4, NTFS, NILFS, the energy consumption of EPS-RAID which consists of 2 disks of each grouping has effectively improved under the premise of ensuring performance and reliability.