Spring 2015

STAIR Codes: A General Family of Erasure Codes for Tolerating Device and Sector Failures in Practical Storage Systems

Wednesday, Feb. 11, 2015 11:00 am11:30 am PST

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Calvin Lab Auditorium

Practical storage systems often adopt erasure codes to tolerate device failures and sector failures, both of which are prevalent in the field. However, traditional erasure codes employ device-level redundancy to protect against sector failures, and hence incur significant space overhead. In this talk, I will present a general family of erasure codes called STAIR codes, which efficiently and provably tolerate both device and sector failures without any restriction on the size of a storage array and the numbers of tolerable device failures and sector failures. We propose the upstairs encoding and downstairs encoding methods, which provide complementary performance advantages for different configurations. We conduct extensive experiments to justify the practicality of STAIR codes in terms of space saving, encoding/decoding speed, and update cost.