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:
Jun. 07, 2005
Filed:
Mar. 26, 2003
Adi Ofer, Wellesley, MA (US);
William P. Powers, Jr., Sutton, MA (US);
Gilad Sade, Newton, MA (US);
Amit Kumar, Franklin, MA (US);
Stephen R. Ives, Shrewsbury, MA (US);
Ran Margalit, Providence, RI (US);
Daniel E. Rabinovich, Wrentham, MA (US);
Peng Yin, South Grafton, MA (US);
Adi Ofer, Wellesley, MA (US);
William P. Powers, Jr., Sutton, MA (US);
Gilad Sade, Newton, MA (US);
Amit Kumar, Franklin, MA (US);
Stephen R. Ives, Shrewsbury, MA (US);
Ran Margalit, Providence, RI (US);
Daniel E. Rabinovich, Wrentham, MA (US);
Peng Yin, South Grafton, MA (US);
EMC Corporation, Hopkinton, MA (US);
Abstract
A scheduler for selecting a logical volume for scheduling pending I/O tasks for job generation. The scheduler includes a main scheduler that selects from among multiple sub-schedulers that operate according to different scheduling approaches, e.g., high priority read I/O request scheduling, urgency of non-read I/O tasks, as well as load balancing and round robin schemes. In selecting a sub-scheduler, the main scheduler considers the amount of time allocated to performing read I/O requests, as well as the level of urgency associated with the logical volumes and the disk adapter that manages those logical volumes for non-read I/O tasks.