Adapting erase cycle parameters to promote endurance of a memory

摘要

In a data storage system including a non-volatile memory array, a controller repeatedly determines at least one health metric of the non-volatile memory array during an operating lifetime of the non-volatile memory array. In response to determining the at least one health metric, the controller selectively varies an erase parameter of the non-volatile memory array over the operating lifetime of the non-volatile memory array, such that endurance of the non-volatile memory array is improved.

主权项

1. A method in a data storage system including a non-volatile memory array controlled by a controller, the method comprising:
selecting and implementing a first value among a plurality of alternative values as a value of an erase parameter of the non-volatile memory, wherein the selecting includes selecting the first value such that a bit error rate for the non-volatile memory array is greater than that which would be achieved if a second value among the plurality of alternative values for the erase parameter were selected; thereafter, during an operating lifetime of the non-volatile memory array, the controller repeatedly determining at least one health metric of the non-volatile memory array, wherein the at least one health metric includes one based on the bit error rate; and in response to the determining of the at least one health metric, the controller selectively varying the value of the erase parameter of the non-volatile memory array over the operating lifetime of the non-volatile memory array such that the bit error rate is controlled in accordance with a bit error rate threshold greater than the bit error rate, wherein endurance of the non-volatile memory array is improved.