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:
Nov. 22, 2005
Filed:
Apr. 16, 2003
Applicant:
James R. Shipman, San Jose, CA (US);
Inventor:
James R. Shipman, San Jose, CA (US);
Assignee:
Hitachi Global Storage Technologies Netherlands B.V., Amsterdam, NL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F012/00 ;
U.S. Cl.
CPC ...
Abstract
Expected access times (EATs) of write request to a disk drive are essentially a measure of the predicted service time for the write request. Write Requests generated by a caching storage controller to a disk drive are essentially maintenance functions used to clear the cache. The disk drive modifies the EATs of write commands with a penalty such that read requests requiring disk access are preferentially satisfied. The penalty may be constant or may be established based on one or more factors, and may even be negative if necessary to clear a cache full of writes requiring destaging to disk.