The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 5664187 B1

Date of Patent:

Sep. 02, 1997

Filed:

Oct. 26, 1994

Method and system for selecting data for migration in a hierarchic data

Applicant:

Inventors:

Theresa A Burkes, Meridian, ID (US);

Douglas L Voigt, Boise, ID (US);

Assignee:

Hewlett-Packard Company, Palo Alto, CA (US);

Attorney:

Primary Examiner:

Thomas G Black

Assistant Examiner:

Cheryl Renea Lewis

Int. Cl.

CPC ...

G06F / ; G06F / ; G06F / ;

U.S. Cl.

CPC ...

395621 ; 39518204 ; 395616 ; 395617 ; 395619 ; 395622 ; 711114 ; 371 4015 ;

Abstract

A hierarchic disk array data storage system has multiple storage disks that define a physical storage space and a RAID management system that maps the physical storage space into two virtual storage spaces. The RAID-level virtual storage space presents the physical storage space as mirror and parity RAID areas where the mirror RAID areas store data according to RAID Level 1 and the parity RAID areas store data according to RAID Level 5. The application-level virtual storage space presents the physical storage space as multiple virtual blocks which can be associated with mirror and parity RAID areas. The RAID management system migrates the virtual blocks between the mirror and parity RAID areas to optimize performance and reliability. To select virtual blocks for migration from mirror to parity RAID areas, a frequency distribution table is created to characterize the virtual blocks according to a predetermined distribution criteria. A virtual block is selected by segmenting the frequency distribution table to identify virtual blocks. The application-level virtual storage space is searched until a virtual block that satisfies the selection criterion is located. The located virtual block is then migrated to the parity RAID area.

Find Patent Forward Citations

Quick Actions:

Burkes, Theresa. (1997). Method and system for selecting data for migration in a hierarchic data (U.S. Patent No. 5664187). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5664187

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile