Methods and apparatus for updating information in a computer system using logs and state identifiers
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United States of America Patent
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Jan 16, 1996
Issued Date -
N/A
app pub date -
Apr 14, 1994
filing date -
Jun 29, 1990
priority date (Note) -
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Abstract
A data processing system maintains logs for system and media recovery. The logs contain state identifiers each uniquely identifying the state of a corresponding section of a storage medium, such as a disk. The state identifiers are assigned after changes have been made such that they can be determined from the information in the logs. One implementation involves assigning state identifiers in a known sequence, such as in a monotonically increasing sequence of integers beginning with zero.
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