Method for reorganizing the data on a RAID-4 or RAID-5 array in the absence of one disk
Patent 6269453 Issued on July 31, 2001. Estimated Expiration Date: 
July 31, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
July 31, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesSystem for recovering data stored in failed memory unit Disk format for secondary storage system Data error correction system Disk drive memory Disk drive memory Disk drive memory Method for performing on-line reconfiguration of a disk array concurrent with execution of disk I/O operations Patent #: 5574851 InventorAssigneeApplicationNo. 084370 filed on 06/29/1993US Classes:714/6, Redundant stored data accessed (e.g., duplicated data, error correction coded data, or other parity-type data)714/19, Undo record714/49, State error (i.e., content of instruction, data, or message)714/764Error correct and restoreExaminersPrimary: Wright, Norman M.Attorney, Agent or FirmInternational ClassG06F 011/00AbstractIn a storage system having a plurality of disks arranged in a RAID array with one of the disks failed, a method of reorganizing the data on the RAID array at the time of failure to prevent both a decrease in performance of the array and reliability of the data and an increase in the cost of operation. Data from the failed disk is regenerated one strip at a time and written onto the original parity chunk for the strip. The resulting fully folded array has the characteristics of a RAID level 0 array. When a replacement disk is inserted into the array the process is reversed to bring the fully folded array back to a fully redundant condition.Other References
Field of SearchState error (i.e., content of instruction, data, or message)Error detection or notification State recovery (i.e., process or data file) Undo record Plural recovery data sets containing set interrelation data (e.g., time values or log record numbers) Redundant stored data accessed (e.g., duplicated data, error correction coded data, or other parity-type data) Of memory or peripheral subsystem Error correct and restore | |
