Patent ID: 8438348
Filing Date: 2013-05-07
Classification: G06F

Abstract:
1. A disk array device, comprising: a disk array; a controller thereof; a power supply unit for normal operation; and a battery for backup, the controller including a first memory storing first data for normal operation and a second memory for backup, the first memory comprising volatile memory and the second memory comprising nonvolatile memory, wherein, during backup control of the first data at a time of an occurrence of a blackout and a return of power, a first mode in which the first data is retained based on power supplied from the battery to the first memory, and a second mode in which the first data of the first memory is evacuated onto the second memory based on power supplied from the battery to respective units and which waits for the return of power, are used, wherein, upon a blackout occurring, the disk array device is suspended and first operates in the first mode with battery power, integrates a blackout continuous time during operation of the disk array device in the first mode, and shifts from the first mode to the second mode to operate in the second mode upon the blackout continuous time reaching a predetermined time period corresponding to the battery power and a configuration of the first and second memories, wherein the disk array device includes a processing function for allowing a user to select and set a desired pattern from a first pattern, a second pattern, and a third pattern on a setting screen as a pattern of backup control, wherein, in the first pattern, the blackout continuous time is integrated during the first mode, and, at a timing in which an integrated value based on the blackout continuous time reaches a corresponding predetermined value, the first mode is shifted to the second mode, wherein, in the second pattern, a battery discharge amount is integrated during the first mode, and, at a timing in which an integrated value based on the battery discharge amount reaches a corresponding predetermined value, the first mode is shifted to the second mode, and wherein, in the third pattern, the blackout continuous time and a battery discharge amount are integrated during the first mode, and, at a timing when an integrated value based on both of the blackout continuous time and the battery discharge amount reaches a corresponding predetermined value, the first mode is shifted to the second mode.