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:
Aug. 10, 2010
Filed:
Jun. 02, 2008
Sumit Gupta, Newark, CA (US);
Sumit Gupta, Newark, CA (US);
Oracle America, Inc., Redwood City, CA (US);
Abstract
A method for handling input/output (I/O) commands in a storage system includes establishing first and second counters for counting unfinished I/O commands, and establishing a reference which is initially set to the first counter. The reference is periodically switched between the first counter and the second counter, and the switching interval is less than the I/O timeout value. Upon placing an I/O command into an I/O command queue, a copy of the current reference is made into an I/O specific control block and the current referenced counter is incremented. Upon finishing of an I/O command, the counter referenced by the I/O specific control block is decremented and the I/O command is removed from the I/O command queue. When switching the reference, a problem is detected in the event that the counter being switched to is above a predetermined threshold. Upon detection of a problem, a more explicit I/O check is conducted.