Implementing feedback directed deferral of nonessential DASD...

Details Implementing feedback directed deferral of nonessential DASD... Implementing feedback directed deferral of nonessential DASD...

2006-02-23

2008-10-28

Ellis, Kevin (Department: 2187)

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

C711S150000, C711S151000, C711S152000, C711S168000

Reexamination Certificate

active

07444466

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.

REFERENCES:
patent: 4620278 (1986-10-01), Ellsworth et al.
patent: 6442648 (2002-08-01), Genduso et al.
patent: 2006/0047897 (2006-03-01), Thiessen et al.
patent: 2006/0288184 (2006-12-01), Riska et al.

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