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. 04, 2014
Filed:
Aug. 18, 2011
Naveen Krishnamurthy, Bangalore, IN;
Robert L. Sheffield, Jr., Boulder, CO (US);
Rajeev Srinivasa Murthy, Bangalore, IN;
Naveen Krishnamurthy, Bangalore, IN;
Robert L. Sheffield, Jr., Boulder, CO (US);
Rajeev Srinivasa Murthy, Bangalore, IN;
LSI Corporation, San Jose, CA (US);
Abstract
The present invention is directed to a command block protocol which may implemented by RAID firmware for synchronizing I/Os in a RAID system which includes co-existing hardware and software-based I/O paths. The command block protocol of the present disclosure ensures that there aren't any I/Os outstanding in the fast path or any other hardware engine by making sure that the region lock (ex.—Sentinel Region Lock) is taken for the entire size of the volume. When the Sentinel Region Lock is granted, the RAID firmware may assume that there aren't any commands outstanding in the fast path hardware or pending for the region lock to be obtained. The RAID firmware would not be able to maintain integrity of user data in the absence of the new command block protocol disclosed herein.