Electrical computers and digital processing systems: memory – Addressing combined with specific memory configuration or... – Dynamic-type storage device
Patent
1997-09-18
1998-07-07
Chan, Eddie P.
Electrical computers and digital processing systems: memory
Addressing combined with specific memory configuration or...
Dynamic-type storage device
711112, 711203, 395888, G06F 1210
Patent
active
057784116
ABSTRACT:
A method and corresponding controller apparatus for creating, updating and maintaining mapping information in a virtual mass storage subsystem. A request to manipulate a virtual block or cluster identifies a particular virtual block number. The virtual block number is mapped to a first physical block number by a direct calculation. A header data structure contained in the first physical block contains mapping information to locate other physical blocks associated with the virtual cluster. In addition to the header data structure, the first physical block contains a portion of the stored data for the corresponding virtual cluster. Additional physical blocks which stored the data of the virtual cluster are located from the mapping information in the header of the first physical block. The methods of the present invention provide improved performance and reduced buffer memory requirements in the virtual mass storage controller circuits of the subsystem as compared to prior approaches.
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DeMoss Robert A.
Humlicek Donald R.
Bailey Wayne P
Bragdon Reginald G.
Chan Eddie P.
Fishman Daniel N.
Symbios, Inc.
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