Instant copy of data through pointers interchanging

Details Instant copy of data through pointers interchanging Instant copy of data through pointers interchanging

2006-07-21

2009-12-29

Nguyen, Than (Department: 2187)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C711S202000

Reexamination Certificate

active

07640410

ABSTRACT:
A system and method are described to improve the efficiency of copy-on-write operations in a storage system. A partition mapping table is maintained in a cache memory, where the partition mapping table is used to translate logical partitions into physical partitions. A request is received to write one or more blocks BB to a partition PSS, and, upon receiving the request, the pointers in the partition mapping table are interchanged such that data associated with PSS is now associated with a second partition PTT. Next, block(s) BB is written to PSS and an indication is made on the PDSS descriptor that all other data blocks in the partition PSS are invalid.

REFERENCES:
patent: 6532527 (2003-03-01), Selkirk et al.
patent: 6792518 (2004-09-01), Armangau et al.
patent: 7073038 (2006-07-01), Milligan et al.
patent: 7318134 (2008-01-01), Oliveira et al.
patent: 2006/0047998 (2006-03-01), Darcy

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