Electrical computers and digital processing systems: memory – Storage accessing and control – Hierarchical memories
Patent
1995-10-13
1999-08-03
Le, Dieu-Minh T.
Electrical computers and digital processing systems: memory
Storage accessing and control
Hierarchical memories
39518201, 39518206, 711114, 711133, G06F 1100, G06F 1212
Patent
active
059335920
ABSTRACT:
A RAID array includes redundant storage devices. Data is distributed across the storage devices, and organized as slivers of RAID protected data blocks. This redundancy provides for the reconstruction of valid data when data at a particular data block of a sliver is found to be inconsistent. However, when more than one data block of a sliver is found to have inconsistent data, reconstruction of the inconsistent data blocks may not be possible. Nonetheless, data consistency can still be restored to that sliver. Consistency is restored to such a sliver by replacing any inconsistent data in a data block with predetermined data and reconstructing the parity data block using the predetermined data. Other data in the RAID array keeps track of those data blocks with the predetermined data to indicate that such blocks do not contain valid data.
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Ellis Robert A.
Jackson James Perry
Lubbers Clark E.
McLean Ronald H.
Sicola Stephen J.
Digital Equipment Corporation
Le Dieu-Minh T.
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