Implementing feedback directed deferral of nonessential DASD operations
AssigneeInternational Business Machines Corporation
InventorsLarry J. Cravens, Jay Paul Kurtz, Kenneth Gerald Linn, Glen W. Nelson, Kenneth Charles Vossen, Donald L. Ward
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Abstract
A method, apparatus and computer program product are provided for implementing feedback directed deferral on nonessential direct access storage device (DASD) operations. A kernel DASD I/O manager maintains a queue depth count value for a DASD unit and maintains a busy flag that indicates when the queue depth count value is greater than a predefined threshold. The kernel DASD I/O manager defers optional operations responsive to the busy flag being set for the DASD unit.
Claims6
A computer implemented method for implementing feedback directed deferral on nonessential direct access storage device (DASD) operations comprising the steps of:
- maintaining a queue depth count value for a DASD unit;
- setting a busy flag responsive to said queue depth count value being greater than a predefined threshold;
- deferring optional operations responsive to the busy flag being set for the DASD unit;
- identifying a changed page in memory and checking to determine whether the page is deferred, and writing the changed page responsive to the page being deferred.
Dependencies are inferred from the claim text.