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:
Sep. 18, 2012
Filed:
May. 22, 2008
John L. Neemidge, Austin, TX (US);
Nishant B. Shah, Austin, TX (US);
Stephen M. Tee, Marble Falls, TX (US);
Teerasit Tinnakul, Pflugerville, TX (US);
John L. Neemidge, Austin, TX (US);
Nishant B. Shah, Austin, TX (US);
Stephen M. Tee, Marble Falls, TX (US);
Teerasit Tinnakul, Pflugerville, TX (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
The present invention provides a computer implemented method and apparatus to revising logical unit ownership in a host. A host receives an error message from a storage subsystem having at least two storage controllers and at least one logical unit coupled to at least one of the storage controllers. The host suspends I/O from the host to the storage subsystem. The host transmits a verification of logical unit ownership query to the storage subsystem. The host determines that ownership between a host and a logical unit on the at least one of the storage controllers has changed from a mapping table of the host. Responsive to a determination that ownership has changed, the host updates ownership in a mapping table of the host to reflect the ownership between the host and the logical unit. The host resumes I/O from the host to the storage subsystem, wherein the host routinely exchanges I/O with the storage subsystem.