Patent ID: 8862808

Claim:
A control apparatus that saves data which is stored in a cache memory of a storage when a power supply from a power supply unit to the storage is stopped, the control apparatus comprising: a capacitor to store electric power supplied from the power supply unit and to supply the stored electric power to the control apparatus when the power supply from the power supply unit is stopped; a first nonvolatile memory; a second nonvolatile memory; a first controller; and a second controller coupled to the first controller, the first controller to: write the data, stored in the cache memory, into the first nonvolatile memory when the external power supply is stopped, verify whether the data stored in the first nonvolatile memory is normal, and send, to the second controller, log information for an address of the first nonvolatile memory in which writing of the data fails when the verification indicates that the writing to the address of the first nonvolatile memory is failure, and the second controller to write the log information for the address of the first nonvolatile memory sent from the first controller into the second nonvolatile memory.