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:
Oct. 30, 2001
Filed:
Jun. 30, 1997
Kenneth A. Halligan, Leominster, MA (US);
Erez Ofer, Brookline, MA (US);
John T. Fitzgerald, Mansfield, MA (US);
EMC Corporation, Hopkinton, MA (US);
Abstract
The invention relates to a method and apparatus for reordering, at a disk drive controller, a received sequence of read and write commands. The reordering can be system driven so that the system, when a command stalls, examines the command queue for another command to execute. Alternatively, the command queue itself can be reordered depending upon the expected time it takes for various commands to execute. Reordered commands can be flagged so that they cannot be reordered again. The resulting increase in throughput and efficiency occurs without reference to the particular disk drive or disk drive array configuration to which the controller is connected.