Method and apparatus for dynamic sparing in a RAID storage syste

Error detection/correction and fault detection/recovery – Data processing system error or fault handling – Reliability and availability

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711114, G06F 1100

Patent

active

061548537

ABSTRACT:
A method of dynamically changing a storage system from a RAID configuration to a mirror configuration is provided. The change occurs when a device begins to fail or fails completely. Data from the logical volumes of the failed device is written to corresponding parity volumes within the RAID group. In addition, data from all logical data volumes is copied to spare devices. Once all the data is copied, the system operates in a mirrored mode. A mirrored mode includes writing data to both and active and backup volume for each write transaction. When the failed device is replaced the data and parity volumes are restored. Once restored, the spare devices are returned to inactive status.

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