Device driver, method and computer-readable medium for dynamically configuring a storage controller based on RAID type, data alignment with a characteristic of storage elements and queue depth in a cache

A storage controller coupled to a host computer is dynamically configured by a device driver executing in the host computer. The storage controller manages a logical volume for the host using a set of flash-based storage devices arranged as a redundant array of inexpensive disks (RAID). The device d...

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Bibliographic Details
Main Authors PANDA SIDDHARTHA KUMAR, SABLOK KUNAL, SIMIONESCU HORIA, SUNDRANI KAPIL
Format Patent
LanguageEnglish
Published 01.03.2016
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
PHYSICS
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Summary:A storage controller coupled to a host computer is dynamically configured by a device driver executing in the host computer. The storage controller manages a logical volume for the host using a set of flash-based storage devices arranged as a redundant array of inexpensive disks (RAID). The device driver identifies a RAID type for the logical volume and a queue depth from a stream of I/O commands. For a logical volume in RAID 0, the device driver compares the queue depth to a threshold value and configures the storage controller to process the stream of I/O commands with a first path or an alternative path based on a result of the comparison. For a logical volume in RAID 5, the device driver performs a similar comparison and uses the result to direct the storage controller to use a write back or a write through mode of operation.
Bibliography:Application Number: US201414272651