At risk data caching (ARDC)

摘要

A method, computer program product, and computing system for sensing the occurrence of an degraded condition within a data stripe of a RAID array. The data strip includes one or more valid data portions, one invalid data portion, and a parity portion. A request to write updated content to a target data portion within the data stripe is received, wherein the target data portion is one of the valid data portions. The valid data portions and the parity portion are read from the data stripe. The invalid data portion is reconstructed using the valid data portions and the parity portion, thus generating a reconstructed data portion. The reconstructed data portion is stored within a mirrored cache memory system. The parity portion is updated to define the updated content, thus defining an updated parity portion. The updated parity portion is written to the data stripe and the updated content is written to the target data portion within the data stripe.

主权项

1. A computer-implemented method comprising:
sensing an occurrence of a degraded condition within a data stripe of a RAID array, wherein the data strip includes one or more valid data portions, one invalid data portion, and a parity portion; receiving a request to write updated content to a target data portion within the data stripe, wherein the target data portion is one of the valid data portions; preventing the data stripe from entering an uncorrectable condition by reading the valid data portions and the parity portion from the data stripe upon sensing the occurrence of the degraded condition and receipt of request to write for one of the valid data portions; reconstructing the invalid data portion using the valid data portions and the parity portion by performing an XOR operation on the combination of the valid data portions and the parity portion, thus generating a reconstructed data portion; storing the reconstructed data portion within a mirrored cache memory system, wherein the mirrored cache memory system is powered by a different power supply from a local cache memory system and is configured to provide a backup in the event of an uncorrectable condition within the local cache memory system; updating the parity portion to define the updated content, thus defining an updated parity portion; and writing the updated parity portion to the data stripe and the updated content to the target data portion within the data stripe.