Prefetching and storing device work information from multiple da

Details Prefetching and storing device work information from multiple da Prefetching and storing device work information from multiple da

1997-11-14

2000-03-14

Sheikh, Ayaz R.

Electrical computers and digital data processing systems: input/

Input/output data processing

710100, 710113, 711162, 712 11, 712 18, G06F 1300

Patent

active

060386134

ABSTRACT:
A device controller is described within a data storage system for pre-fetching device work information from multiple data storage devices, and accumulating the device work information to immediately respond to a subsequent device poll command from a storage controller. The device controller includes a device receiver to receive the device poll command, a device transmitter to transmit a response to the device poll command, a device information register for storing the pre-fetched device work information for each data storage device, and a sequencer for periodically pre-fetching the device work information from each data storage device. The sequencer pre-fetches such information by verifying that no device subsystem command from the storage controller is pending in the device receiver, then issuing a background poll command to a selected device to query the device for its device work information, and storing the device work information in the device information register. The device controller can then immediately respond to a subsequent device poll command issued from the storage controller by copying the device work information from the device information register to the device transmitter.

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