METHODS AND APPARATUS FOR NON-DISRUPTIVE UPGRADE BY REDIRECTING I/O OPERATIONS

Patent №

US 7,890,664

Granted

2011-02-15

Filed 2008

Owner

EMC CORPORATION

Lab

—

AI components

hardware

Assignment

Recorded

Dataset

AIPD

2023_r1 edition

Application

12059071

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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.

AI hardwareG06F 9/4411G06F 9/44505

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Ownership

EMC CORPORATION

assignment · 213400158

Assignors

TAO, TAO, BAPPE, MICHAEL E., SANDSTROM, HAROLD M., EPSTEIN, EDITH, WEST, ERIC I., RAIZEN, HELEN S., KUDVA, SANTHOSH V.

On an employer assignment, the assignors are typically the inventors.

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