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.:
Date of Patent:
Aug. 03, 1999
Filed:
May. 19, 1997
Jaishankar Moothedath Menon, San Jose, CA (US);
Larry Joseph Stockmeyer, San Jose, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
An information storage system selects target segments for garbage collection only if their age in the information storage system exceeds an age threshold value and, once past the age threshold, in the order of least utilized segments first. The system determines the age of a segment by determining the amount of time a segment has been located in direct access storage devices (DASD) of the information storage system and considers a segment for garbage collection only after the segment has been located in DASD for the selected age threshold value. From the set of candidate segments, the system chooses one or more for garbage collection in the order in which they will yield the most free space. The free space yield is determined by utilization data, so that the least utilized segments are garbage-collected first.