Dynamically scalable disk array
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United States of America Patent
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N/A
Issued Date -
Dec 19, 2002
app pub date -
Jan 29, 2002
filing date -
Jan 29, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A dynamically scalable storage system is described. The system includes a first plurality of disk drives for storing distributed parity groups. Each distributed parity group includes storage blocks arranged as one or more data blocks and a parity block. Each storage block is stored on a separate disk drive such that no two storage blocks from a given distributed parity group reside on the same disk drive. File system metadata is used to describe a location of each of said storage blocks by specifying a disk identifier and a logical block identifier of a first logical block of each storage block. A processor manages the file system metadata. The processor recognizes when a new disk drive is added to the plurality of disk drives and causes one or more existing storage blocks to be moved to the new disk drive to balance usage of all drives. The processor also updates the file system metadata.
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