MAINTAINING A PARITY-INCONSISTENT TABLE TO IDENTIFY STRIPES AFFECTED BY A WRITE HOLE EFFECT
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United States of America Patent
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Issued Date -
Feb 2, 2017
app pub date -
Jul 27, 2015
filing date -
Jul 27, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
A method performed by a redundant array of independent disks (RAID) controller includes retrieving, from a table, information identifying a stripe in a RAID following a system crash in the RAID. Data was to be written to the stripe in response to a write command and prior to the system crash. The information identifies respective data arrays and a respective parity drive identified by the stripe. The information is generated and written to the table prior to writing the data to the respective disk arrays and the respective parity drive identified by the stripe, and prior to the system crash. For the identified stripe, parity data is determined using data stored in the respective data arrays identified by the stripe. The determined parity data is written to the parity drive identified by the stripe.
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