Enhanced file system failure tolerance
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United States of America Patent
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N/A
Issued Date -
Nov 21, 2002
app pub date -
Jan 29, 2002
filing date -
Jan 29, 2001
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
An enhanced file system with failure tolerance is described. The enhanced file system includes a plurality of disk drives for storing parity groups, each parity group comprising storage blocks. The storage blocks include one or more data blocks and a parity block associated with the data blocks. Each of the storage blocks is stored on a separate disk drive such that no two storage blocks from a given parity group reside on the same disk drive. A recovery module dynamically recovers data lost when a disk drive becomes unavailable. The recovery module produces a reconstructed block by using information in the remaining storage blocks of a parity group corresponding to an unavailable storage block, and stores the reconstructed block on a functioning drive. The file system metadata is updated to indicate where the reconstructed block is stored.
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