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Published in:
2011 | OriginalPaper | Chapter
Software RAID 5 for OLTP Applications with Frequent Small Writes
Authors : Kijeong Khil, Dongho Kwak, Seokil Song, Yunsik Kwak, Seungkook Cheong
Published in: Future Information Technology
Publisher: Springer Berlin Heidelberg
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In this paper, we propose a DDR-SSD conscious software RAID system for OLTP applications. The proposed software RAID employs a logging based method to improve the performance of software RAID 5. Small writes that are frequently occurred in OLTP applications are the main factor to degrade the performance of RAID systems. Several methods for a hard disk based software RAID system are proposed to solve the small write problems. It is straightforward to apply the existing methods to a DDR-SSD based software RAID system. However, DDR-SSDs have unique characteristics which are different from hard disks. If the unique characteristics are taken into account carefully when designing the software RAID system, its overall performance will be improved. In this paper, we propose a differential-logging method considering the DDR-SSD to solve the small write problem. We show that our proposed method outperforms the existing software RAID through simulations.