Redundant controller data storage system having an on-line controller removal system and method

摘要

A redundant controller data storage system having an on-line controller removal system and method is described. In one aspect, the method of on-line removal of a controller from a redundant controller system according to the present invention includes the redundant controller system having a first controller and a second controller. Partial removal of the first controller from the redundant controller system is detected. A shut-down sequence is performed on the first controller and the second controller, including completing outstanding memory accesses. The first controller is defined to have a first memory, and the first memory is placed into a self-refresh mode. Removal of the first controller from the redundant controller system is finished.