Method for optimal retrieval of non-volume-specific data

Details Method for optimal retrieval of non-volume-specific data Method for optimal retrieval of non-volume-specific data

1995-02-28

1997-02-25

Swann, Tod R.

Boots, shoes, and leggings

395858, 395403, 395479, 395438, 395445, 395857, 395439, 364DIG1, G06F 1314, G06F 1202

Patent

active

056066791

ABSTRACT:
A method and apparatus for improving storage controller throughput and reducing unit control block contention when selecting a Utility Volume for servicing non-specific read requests. Throughput is increased by enabling the storage controller to service non-specific read requests issued against a Utility Volume which is not the same as the device associated with the data that the non-specific read is requesting. The Utility Volume is dynamically selected by considering the current loads on the available devices for both specific and non-specific processing. A Penalty Index is assigned to each volume, wherein the Penalty Index is a weighted average of the specific and non-specific processing. The device having the lowest Penalty Index is selected as the Utility Volume for a session. A Penalty Index evaluation is made at a Reference Point which is further enabled by a random clock to ensure that sessions do not likely pick the same Utility Volume.

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