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. 11, 2009
Filed:
Jun. 29, 2004
Yechiel Yochai, Lincoln, RI (US);
Yechiel Yochai, Lincoln, RI (US);
EMC Corporation, Hopkinton, MA (US);
Abstract
In a data storage system having a drive I/O command queue associated with a data storage device, contiguous I/O requests of at least a predetermined size may be processed in a pipeline mode of operation by issuing to the command queue a plurality of contiguous I/O request portions, each comprising a portion of the I/O request, so that a next one of the I/O request portions is in the command queue before the data storage system completes a current I/O request portion. The data storage device may implement I/O reordering based on data location and contain at least two device I/O command queues or, alternatively, may not implement such reordering and contain a single command queue. In one embodiment, a performance parameter of the data storage system, such as the bandwidth requirement for the contiguous I/O request, is monitored and the size of subsequent I/O request portions and/or the state of the pipeline mode of operation are adjusted accordingly. With this arrangement, large contiguous I/O requests can be executed at a higher bandwidth, without adversely impacting other I/O requests for the same device.
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