Warped Mirrors for Flash

Provided by: Institute of Electrical & Electronic Engineers
Topic: Storage
Format: PDF
Flash-based devices are cost-competitive to traditional hard disks in both personal and industrial environments and offer the potential for large performance gains. However, as flash-based devices have a high bit-error rate and a relatively short lifetime, reliability issues remain a major problem. One possible solution is redundancy; using techniques such as mirroring, data reliability and availability can be greatly enhanced. All standard RAID approaches assume that devices do not wear out, and hence distribute work equally among them; unfortunately, for flash, this paper is not appropriate as the life of flash cell depends on the number of times it is written and cleaned.

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