Separating a hybrid asymmetric mix of a RAID 1 mirror and a parity-based RAID array
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United States of America Patent
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Aug 22, 2017
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May 21, 2015
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May 21, 2015
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Abstract
A RAID controller stores data in a hybrid asymmetric mix of a RAID 1 mirror and a parity-based RAID array, wherein a first side of the RAID 1 mirror includes a single data storage device storing an operating system image and a second side of the RAID 1 mirror includes a plurality of data storage devices forming a parity-based RAID array. The RAID controller normally calculates parity using data from both the single data storage device and the plurality of data storage devices. However, in response to a user command, the RAID controller recalculates parity stripes on each of the plurality of data storage devices using a predetermined data pattern for a logical data storage device logically replacing the single data storage device storing the operating system. Accordingly, the same stripe count is maintained and the parity-based RAID array maintains redundancy despite physical separation of the single data storage device.
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