Electrical computers and digital processing systems: memory – Address formation – Address mapping
Reexamination Certificate
2006-08-01
2006-08-01
Moazzami, Nasser (Department: 2187)
Electrical computers and digital processing systems: memory
Address formation
Address mapping
C711S162000, C711S206000
Reexamination Certificate
active
07085909
ABSTRACT:
Various copy-on-write implementations for a computing environment are presented. One copy-on-write implementation includes employing a read mapping table to perform a first virtual block to physical block mapping for use in reading a block of data of a file to be copy-on-written from physical storage for modification; and employing a different, write mapping table to perform a second virtual block to physical block mapping for use in writing a modified block of the file data to physical storage, wherein copy-on-write of the block of data is achieved using a single write operation. In another implementation, a distributed copy-on-write of a file for a client server environment is presented. This distributed copy-on-write includes performing, by a first client, copy-on-write of at least one block of data of the file to be copy-on-written, and performing, by a second client, copy-on-write of at least one other block of data of the file, wherein multiple clients perform the copy-on-write of the file.
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Ananthanarayanan Rajagopal
Becker-Szendy Ralph A.
Burns Randal C.
Long Darrell D. E.
Rees Robert M.
Heslin Rothenberg Farley & & Mesiti P.C.
International Business Machines - Corporation
Moazzami Nasser
Radigan, Esq. Kevin P.
Raissinia, Esq. Abdy
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