BACKUP METHOD, STORAGE METHOD, AND DISC ARRAY DEVICE

摘要

The backup method according to the present embodiment for a controller adapted to control a disk array apparatus and provided with a volatile memory and a nonvolatile memory to save data held in the volatile memory into the nonvolatile memory, is characterized by including adding an error detection code to information on a plurality of invalidity management tables indicating a bad region in the nonvolatile memory storing the plurality of invalidity management tables to which the error detection code is added in the nonvolatile memory determining the presence or absence of an error in one invalidity management table selected among the plurality of invalidity management tables on the basis of the error detection code and saving the data held in the volatile memory into the nonvolatile memory by using the invalidity management table not selected in a case where it is determined that the error is present.