Scheduling of reconstructive I/O read operations in a storage environment

摘要

A system and method for effectively scheduling read and write operations among a plurality of solid-state storage devices. A computer system comprises client computers and data storage arrays coupled to one another via a network. A data storage array utilizes solid-state drives and Flash memory cells for data storage. A storage controller within a data storage array comprises an I/O scheduler. The storage controller is configured to receive a read request targeted to the data storage medium, and identify at least a first storage device of the plurality of storage devices which contains data targeted by the read request. In response to either detecting or predicting the first storage device will exhibit variable performance, the controller is configured to generate a reconstruct read request configured to obtain the data from one or more devices of the plurality of storage devices other than the first storage device.

主权项

1. A computer system comprising:
a data storage medium comprising a plurality of storage devices configured to store data in at least one RAID group; and a data storage controller coupled to the data storage medium; wherein the data storage controller is configured to:
receive a read request targeted to the data storage medium;identify at least a first storage device of the plurality of storage devices which contains data targeted by the read request; andmake a determination regarding whether or not to generate a reconstruct read request configured to obtain the data from one or more devices of the plurality of storage devices other than the first storage device, wherein said determination is based at least in part on a programmable weighting, said weighting indicating a preference for one of read response latency or system load.