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Sugar Smash 3.87.122.002191228 Apk + Mod (Lives/Coins) for android1. Field of the Invention
The present invention relates to a storage system, and more particularly to a data storage system having a cache storage.
2. Description of the Related Art
In recent years, the data traffic has been increased by a great extent due to popularization of the Internet, so that a storage system is requested to have a high throughput with respect to a large amount of data traffic. As an example, Japanese Unexamined Patent Application Publication No. 2001-254023 discloses a cache management method that uses a parity code in order to enhance the throughput.
Also, generally, a storage system includes a plurality of mass storage devices (e.g., hard disk drives (HDDs)) serving as a primary storage, and an SSD serving as a cache (secondary storage). There is a technique called a data striping, for example, in which the data is stored in the mass storage devices, i.e., in the HDDs, as a plurality of data chunks.
The data striping makes it possible to decrease a load on the SSD and an access to the HDD, and thus to improve the throughput with respect to the processing of the data stored in the mass storage devices, e.g., the processing of the data I/O and the data copy in the storage system.
However, when a fault, such as a power failure or a mechanical failure, occurs in a part of the hard disk drives, the storage system can no longer read data from the hard disk drives. In this case, if data of the data chunks not yet read remains in the hard disk drives (i.e., when the hard disk drives include still unknown data), the storage system has to wait for the data of the data chunks to be read from the mass storage devices, such as the HDDs, and thus has to suffer from a performance deterioration.
The data striping can, as described above, reduce the accesses to the mass storage devices, i.e., the HDDs, however, it cannot overcome such problems.
If the data striping is performed, the data as a whole is read