Extent redirect

Details Extent redirect Extent redirect

2011-08-30

2011-08-30

Ellis, Kevin L (Department: 2187)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C711S154000

Reexamination Certificate

active

08010759

ABSTRACT:
Redirecting a data object such as a file block extent. The data object can be redirected from a first memory block to a second memory block, wherein the second memory block includes a copy of modified data of the first memory block. The redirection may occur in response to a request to modify data of the data object. Redirection preserves the prior version of the data object stored in the first memory block to enable restoration of the data object if needed. In one embodiment, a first data object is mapped to a first memory block. A copy of data contents of the first memory block is created. Thereafter, data contained within the copy is modified in accordance, for example, with a request to write data to the first data object. The modified copy is stored in a second memory block, and the first data object is mapped to the second memory block.

REFERENCES:
patent: 6732293 (2004-05-01), Schneider
patent: 7257606 (2007-08-01), Kapoor et al.
patent: 2002/0112134 (2002-08-01), Ohran et al.
patent: 2002/0129047 (2002-09-01), Cane et al.
patent: 2003/0005235 (2003-01-01), Young
patent: 2006/0174074 (2006-08-01), Banikazemi et al.
patent: 2007/0226444 (2007-09-01), Yagawa
Andrew Tanenbaum, Structured Computer Organization, 1984, Prentice Hall, pp. 10-12.

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