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:
Sep. 30, 2014
Filed:
Sep. 30, 2013
Method, system, apparatus, and computer-readable medium for implementing caching in a storage system
American Megatrends, Inc., Norcross, GA (US);
Paresh Chatterjee, Fremont, CA (US);
Srikumar Subramanian, Newark, CA (US);
Srinivasa Rao Vempati, Milford, MA (US);
Suresh Grandhi, Fremont, CA (US);
American Megatrends, Inc., Norcross, GA (US);
Abstract
A method, system, apparatus, and computer-readable medium are provided for performing read-ahead operations for sequential read operations. A method includes maintaining a bitmap including a plurality of bits, each bit corresponding to a sector of the disk cache and containing data indicating whether the corresponding sector is valid and can be used to satisfy read requests. The method includes receiving a request to read a sector of the disk cache, and in response, identifying a bit in the bitmap that corresponds to the requested sector. Further, the method includes determining whether the disk cache contains valid data for a sector previous to the requested sector by examining a bit in the bitmap previous to the bit that corresponds to the requested sector, and in response, reading sequentially into the disk cache sectors of the disk cache corresponding to bits in the bitmap following the bit corresponding to the requested sector.