METHOD FOR BACKING UP DATA DURING MEMORY SYSTEM POWER-DOWN, AND MEMORY SYSTEM CONTROLLER

摘要

The present invention discloses a method for backing up data in a case of a power failure of a storage system, and a storage system controller. The method includes: when a power failure is detected, acquiring current refresh progress of a buffer in a storage system, an address, in the buffer, of data that is in the buffer and needs to be backed up to a non-volatile memory in the storage system, and first time required for backing up the data; calculating, according to the current refresh progress of the buffer and the address of the data in the buffer, second time for which the data can at least keep being not lost since a last refresh; and stopping refreshing the buffer, and backing up the data to the non-volatile memory, if the second time is greater than the first time. According to the present invention, when a power failure occurs to a storage system and data in a buffer needs to be backed up to a non-volatile memory, a refresh operation is stopped in a case in which data backup can be completed before a refresh is performed again on to-be-backed-up data, so that power consumption resulting from an unnecessary refresh operation can be saved and power supply time of a backup power supply can be extended.