Patent ID: 8479040
Filing Date: 2013-07-02
Classification: G06F,H04L

Abstract:
1. A storage system connected to a host system, comprising: a storage medium for storing data sent from the host system; and a controller including a memory and a processor, wherein the controller comprises: a configuration management unit for managing a storage area provided by the storage medium by dividing it into a plurality of pools, providing a virtual logical device to the host system, and dynamically allocating the storage area to the logical device from a pool associated with the logical device according to a data write request from the host system for writing data into the logical device; a migration unit for changing the pool to allocate the storage area to an area that stored the data in the logical device to another pool according to an access status from the host system to the data written into the logical device, and controlling the storage medium for moving the data to the other pool; and a fault management unit for managing a correspondence relationship of the logical device and the pool, identifying, when a fault occurs in any one of the pools, an extent of impact of the fault based on the correspondence relationship of the logical device and the pool, and notifying the identified extent of impact of the fault to an administrator, and wherein the fault management unit compares a theoretical value of a ratio of the storage area that is assumed to be allocated by the respective pools associated with the logical device to that logical device, and a measured value of a ratio of the storage area that has been actually allocated by the respective pools to that logical device, and identifies the extent of impact of the fault based on the comparative result.