Dynamic data space
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United States of America Patent
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Apr 27, 2004
Grant Date -
N/A
app pub date -
Aug 18, 2000
filing date -
Aug 18, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
A data storage system, such as RAID, upgraded dynamically including multiple stages, providing error checking data without taking the system off-line. Checksums are computed from the data and placed in block 63 of the same disk. The combination of parity bits across the parity disk, the remaining uncorrupted data in the data disks, and checksums within each disk includes sufficient information to enable restoration of corrupt data. The system is upgraded by reserving permanent checksum blocks, writing the checksums to a volume block number, and placing the checksums in permanently reserved checksum block locations after first moving data already there to unreserved blocks.
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