JP2008217811A5 - - Google Patents

Claims (5)

A storage system connected to a computer,
A host interface unit connected to the computer;
A memory path connected to the host interface unit;
A cache memory unit that is connected to the memory path and temporarily stores data transmitted and received from the computer;
A memory controller that is connected to the memory path and controls input / output of data transmitted and received from the computer;
A plurality of nonvolatile memory units connected to the memory controller unit for storing data transmitted and received from the computer;
Have
The nonvolatile memory unit includes a plurality of nonvolatile memory devices and spare nonvolatile memory devices,
The plurality of nonvolatile memory devices and the spare nonvolatile memory device are composed of a plurality of blocks, and storage of data from the computer to the plurality of nonvolatile memory devices is executed in units of the blocks,
When a failure occurs in a block in the plurality of memory devices, the memory controller unit copies data in the failed block to the spare nonvolatile memory device, and accesses the failed block to the spare nonvolatile memory device. And switch
The memory controller unit, when the number of failed blocks in a memory device having the failed block exceeds a preset threshold, suggests replacement of a non-volatile memory device exceeding the threshold system. The storage system according to claim 1, wherein the case where a failure has occurred in the block is a case where the number of updates of the nonvolatile memory device exceeds a preset threshold value. When the number of failed blocks in the memory device having the failed block exceeds a preset threshold, the memory controller unit replaces the memory device and starts a new memory from the plurality of memory devices and the spare nonvolatile memory device. The storage system according to claim 1, wherein data is restored to the device. The memory controller unit replaces the memory device when the number of failed blocks in the memory device having the failed block exceeds a preset threshold, and replaces the replacement data in the spare non-volatile memory device with the new memory device. In the case of a block having no replacement data in the spare nonvolatile memory device, the data is restored by reading the data from the plurality of nonvolatile memory devices excluding the failed block and performing a parity operation. The storage system according to claim 3. The storage system according to claim 1, wherein an indicator of the nonvolatile memory device is turned on as a method for suggesting replacement of the nonvolatile memory device exceeding the threshold.