Contiguous I/O command queuing within a data storage device

Details Contiguous I/O command queuing within a data storage device Contiguous I/O command queuing within a data storage device

2004-06-29

2009-08-11

Chen, Alan (Department: 2182)

Electrical computers and digital data processing systems: input/

Input/output data processing

Input/output data buffering

C710S005000, C710S006000, C710S036000

Reexamination Certificate

active

07574538

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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