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:
Oct. 18, 2005
Filed:
Sep. 18, 2002
Veera W. Deenadhayalan, Fremont, CA (US);
Mark A. Johnson, Rochester, MN (US);
Carlos Querol, Rochester, MN (US);
Michael Roble, Mazeppa, MN (US);
Mohan Rowlands, Union City, CA (US);
Veera W. Deenadhayalan, Fremont, CA (US);
Mark A. Johnson, Rochester, MN (US);
Carlos Querol, Rochester, MN (US);
Michael Roble, Mazeppa, MN (US);
Mohan Rowlands, Union City, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A storage controller and associated disk or disk portion where after the controller terminates its access to said disk or disk portion, data integrity problems in the disk or disk portion can be detected. Before host data associated with a write command is written from the cache memory to the disk or disk portion, an identity of the storage controller as a current user of the disk or disk portion and indication that the controller is operating in a mode it stores data in a cache is recorded on the disk or disk portion. If the storage controller is shut down abnormally, the record of the identity of the controller and the indication are not cleared. The storage controller is restarted or rebooted and the record is read to learn that the controller was using the disk or disk portion and operating in the foregoing mode before the shutdown.