Patent · US Active

Instant copy of data in a cache memory via an atomic command

US7552297B2 · kind B2 · utility

1Cited by

5References

6Claims

0Family size

Assignee

International Business Machines Corporation · US

Inventors

Ofir Zohar · Gdera, IL
Haim Helman · Ramat Gan, IL
Dror Cohen · Even Yehuda, IL
Shemer Schwartz · Herzliya, IL
Yaron Revah · Nes Ziona, IL
Efri Zeidner · Kfar Sava, IL

Key dates

Filing date	Jul 21, 2006
Grant date	Jun 23, 2009
Priority date	—
Expiry date	Jun 5, 2027

Classification

Technology area (CPC G)Physics
CPC primaryG06F2212/284
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

A system and method are described to improve the efficiency of copy-on-write operations in a storage system. A PDSS descriptor associated with partition PSS and a PDTT descriptor associated with partition PTT are maintained in a cache memory, with partition PSS associated with a source logical unit LUS and partition PTT associated with a source logical unit LUT. An ICP flag is set in the PDSS and PDTT descriptors indicating that the PSS and PTT are undergoing a copy-on-write operation. Data is then dissociated with PTT and locations of each block of the PSS stored in memory are copied from the PDSS descriptor to the PDTT descriptor. A task is then created to fetch blocks of the PSS and the fetched blocks are copied from the PSS to the PTT.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.