The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 15, 2011
Filed:
Feb. 14, 2008
Mark P Bendyk, Hyde Park, NY (US);
Daniel F Casper, Poughkeepsie, NY (US);
John R. Flanagan, Poughkeepsie, NY (US);
Clint A. Hardy, Tucson, AZ (US);
Roger G. Hathorn, Tucson, AZ (US);
Catherine C. Huang, Poughkeepsie, NY (US);
Matthew L. Kalos, Tucson, AZ (US);
Louis W. Ricci, Hyde Park, NY (US);
Gustav E. Sittmann, Webster Groves, MO (US);
Harry M. Yudenfriend, Poughkeepsie, NY (US);
Mark P Bendyk, Hyde Park, NY (US);
Daniel F Casper, Poughkeepsie, NY (US);
John R. Flanagan, Poughkeepsie, NY (US);
Clint A. Hardy, Tucson, AZ (US);
Roger G. Hathorn, Tucson, AZ (US);
Catherine C. Huang, Poughkeepsie, NY (US);
Matthew L. Kalos, Tucson, AZ (US);
Louis W. Ricci, Hyde Park, NY (US);
Gustav E. Sittmann, Webster Groves, MO (US);
Harry M. Yudenfriend, Poughkeepsie, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A computer program product, an apparatus, and a method for reducing reserved device access contention at a control unit in communication with a plurality of operating systems via one or more channels are provided. The computer program product includes a tangible storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method that includes receiving a command message at the control unit from a first operating system, including an I/O operation command for a device. A device busy indicator is received, indicating that a second operating system has reserved the device. The command message is queued on a device busy queue in response to the device busy indicator. The control unit monitors for a device end indicator. The device busy queue is serviced to perform the I/O operation command in response to the device end indicator.