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Linux Software RAID Level 0 Technique for High Performance Computing by using PCI-Express based SSD

The Linux-based legacy server systems are configured and used with software RAID to improve the performance of the disk I/O. Server systems requiring high performance prefer a special SSD that connects directly with the PCI-express bus to the SATA interface. However, the problem is that the current Linux kernel and software RAID are difficult to optimize the high-performance SSD based on PCI-Express because it is designed to be optimized for the conventional hard disk. Therefore, we propose the efficient method using re-combination and remapping techniques to improve the performance of software RAID level-0 provided on the Linux kernel level. This proposed method is designed to have more bandwidth at a time by reducing the number of system calls considering the block I/O characteristics of Linux kernel and RAID level 0. As a low-level I/O benchmarking tool, XDD is used to evaluate the performance of the proposed method. According to the experimental results, our performance gains are 28.4% on write bandwidth and 13.77% on read bandwidth compared with legacy software RAID. Moreover, CPU occupancy rates are decreased 81.2% and 77.8%, respectively. Keywords—Software RAID, PCI-E Express SSD, High Performance Computing, Disk I/O, Memory Block Device