Abstract: In the present invention, archive volumes are created in accordance with the size of data that is to be archived, and hence the storage regions are used in an efficient manner. The archive server acquires the data to be archived, via the application server, and detects the size of that data. The archive server issues an instruction to the storage device to cause the the storage device to generate an archive volume having a volume size corresponding to the data size of the data to be archived. The archive server writes the data to be archived to the volume having a storage capacity of the required size, and an access restriction and retention term are respectively established for the volume.

Abstract: In the present invention, archive volumes are created in accordance with the size of data that is to be archived, and hence the storage regions are used in an efficient manner. The archive server acquires the data to be archived, via the application server, and detects the size of that data. The archive server issues an instruction to the storage device to cause the the storage device to generate an archive volume having a volume size corresponding to the data size of the data to be archived. The archive server writes the data to be archived to the volume having a storage capacity of the required size, and an access restriction and retention term are respectively established for the volume.

Abstract: In a system including a plurality of rotatable media type memory devices and disk array storage including in a redundant configuration a plurality of controllers each including a disk array control unit in which a plurality of SCSI bus coupling ports are individually coupled with respective ports of a plurality of host PCs/WSs via SCSI cables, the disk array control unit includes a function to logically transmit a bus operation such as a device or bus reset operation in an arbitrary one of the ports of the disk array storage to other ports. This makes it possible that the ports seems to be physically coupled in a daisy chain when viewed from the host PCs/WSs.

Abstract: In a system including a plurality of rotatable media type memory devices and disk array storage including in a redundant configuration a plurality of controllers each including a disk array control unit in which a plurality of SCSI bus coupling ports are individually coupled with respective ports of a plurality of host PCs/WSs via SCSI cables, the disk array control unit includes a function to logically transmit a bus operation such as a device or bus reset operation in an arbitrary one of the ports of the disk array storage to other ports. This makes it possible that the ports seems to be physically coupled in a daisy chain when viewed from the host PCs/WSs.

Abstract: In a system including a plurality of rotatable media type memory devices and disk array storage including in a redundant configuration a plurality of controllers each including a disk array control unit in which a plurality of SCSI bus coupling ports are individually coupled with respective ports of a plurality of host PCs/WSs via SCSI cables, the disk array control unit includes a function to logically transmit a bus operation such as a device or bus reset operation in an arbitrary one of the ports of the disk array storage to other ports. This makes it possible that the ports seems to be physically coupled in a daisy chain when viewed from the host PCs/WSs.

Abstract: A semiconductor memory is provided which includes an electrically rewritable non-volatile semiconductor memory. A data control circuit is also provided which includes an ECC circuit and which operates to control the writing and reading operations of data to and from the non-volatile semiconductor memory. In order to temporarily hold data which is to written into the non-volatile semiconductor memory, a volatile cache semiconductor memory is utilized. This volatile cache semiconductor memory has a storage capacity which is equal to or less than the storage capacity of the non-volatile semiconductor memory itself. A data control circuit is also provided to read out data from the non-volatile semiconductor memory and the volatile cache semiconductor memory, and to transfer the data from the volatile semiconductor to the non-volatile semiconductor memory.

Abstract: A semiconductor storage including a main flash memory, a volatile write cache, a data control circuit, an alternate flash memory and a power supply. This arrangement permits the use of a smaller write cache in comparison with the use of a non-volatile memory, and also provides decreased capacity of the write cache, permitting high-speed access and long-life.