Stripped mirroring RAID architecture

✍ Scribed by Hai Jin; Kai Hwang

• Book ID: 104426337
• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 389 KB
• Volume: 46
• Category: Article
• ISSN: 1383-7621
• DOI: 10.1016/s1383-7621(99)00027-2

✦ Synopsis

Redundant arrays of independent disks (RAID) provide an ecient stable storage system for parallel access and fault tolerance. The most common fault tolerant RAID architecture is RAID-1 or RAID-5. The disadvantage of RAID-1 lies in excessive redundancy, while the write performance of RAID-5 is only 1/4 of that of RAID-0. In this paper, we propose a high performance and highly reliable disk array architecture, called stripped mirroring disk array (SMDA). It is a new solution to the small-write problem for disk array. SMDA stores the original data in two ways, one on a single disk and the other on a plurality of disks in RAID-0 by stripping. The reliability of the system is as good as RAID-1, but with a high throughput approaching that of RAID-0. Because SMDA omits the parity generation procedure when writing new data, it avoids the write performance loss often experienced in RAID-5.