P-Code: A New RAID-6 Code with Optimal Properties

Provided by: Association for Computing Machinery
Topic: Storage
Format: PDF
RAID-6 significantly outperforms the other RAID levels in disk-failure tolerance due to its ability to tolerate arbitrary two concurrent disk failures in a disk array. The underlying parity array codes have a significant impact on RAID-6's performance. In this paper, the authors propose a new XOR-based RAID-6 code, called the Partition Code (P-Code). P-Code is a very simple and flexible vertical code, making it easy to understand and implement. It works on a group of (prime-1) or (prime) disks, and its coding scheme is based on an equal partition of a specified two-integer-tuple set.

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