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:
Feb. 15, 2011
Filed:
Mar. 31, 2008
Tao Tao, Cambridge, MA (US);
Michael E. Bappe, Loveland, CO (US);
Harold M. Sandstrom, Belmont, MA (US);
Edith Epstein, Arlington, MA (US);
Eric I. West, Brighton, MA (US);
Helen S. Raizen, Jamaica Plain, MA (US);
Santhosh V. Kudva, Karnataka, IN;
Tao Tao, Cambridge, MA (US);
Michael E. Bappe, Loveland, CO (US);
Harold M. Sandstrom, Belmont, MA (US);
Edith Epstein, Arlington, MA (US);
Eric I. West, Brighton, MA (US);
Helen S. Raizen, Jamaica Plain, MA (US);
Santhosh V. Kudva, Karnataka, IN;
EMC Corporation, Hopkinton, MA (US);
Abstract
Methods and apparatus for non-disruptive upgrade by redirecting I/O operations. With this arrangement, a driver upgrade does not require restarting an application. In one embodiment, a method includes installing on a computer a legacy upgrade module in a kernel having a legacy driver with first and second loadable extensions for handling input/output operations for applications to and from devices, retrieving and storing static configuration data from the legacy driver, transferring the stored static configuration data to a new driver, obtaining runtime device configuration data from the devices and transferring the runtime device configuration data to the new driver, and filtering device input/output operations such that prior to cutover input/output operations are directed by the LUM through device stacks for the legacy driver and after cutover input/output operations are directed to the new driver.