Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Reexamination Certificate
2011-08-02
2011-08-02
Elmore, Stephen C (Department: 2185)
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
C711S112000, C711S114000, C711S170000, C711S221000, C707S781000, C707S802000, C707S812000, C714S005110, C714S006130, C714S006130
Reexamination Certificate
active
07991969
ABSTRACT:
A method, system, apparatus, and computer-readable medium are provided for improved maintenance of metadata relating to a mass storage array. The metadata may comprise the data structures utilized by a thin provisioning system. When the metadata changes, such as in response to the modification of the underlying data, changed metadata is created in the memory. A parity block is then read from the row of the array where the changed metadata is to be stored. A new parity is calculated for the row using only the old metadata, the changed metadata, and the parity read from the stripe. The old metadata need not be read from disk expressly, as is usually done. Instead, the value that is present in memory before the metadata change is utilized directly to calculate the new parity. The changed metadata and the new parity are then written to the array.
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Chatterjee Paresh
Muthirisavenugopal Vijayarankan
Narayanan Ajit
American Megatrends Inc.
Elmore Stephen C
McKeon Muenier Carlin Curfman
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