Abstract: The storage device of the present invention has: a first recording unit that records a time zone history of access to each storage area assigned to a virtual volume; a second recording unit that executes a predetermined calculation based on the time zone history of access to a plurality of storage areas belonging to a plurality of pool areas and records the calculation result for each of the plurality of pool areas; a comparison unit that acquires, from the first recording unit, the time zone history of access to an optional storage area among the plurality of storage areas and compares the acquired access time zone history with the calculation result recorded in the second recording unit; and a migration unit that selects, from among the plurality of pool areas, a pool area for which the calculation result is similar to the acquired access time zone history on the basis of the result of the comparison by the comparison unit, and migrates the data stored in the optional storage area to a storage area in the s

Abstract: In a storage apparatus, an MPU acquires a value of power capable of being used to transition a HDD from a power-saving state to an access-enabled state, receives an access command via a host I/F, determines whether or not it is possible to respond to the access command using one or more HDD in the access-enabled state from among the HDD configuring a LU, and when it is determined that it is possible to respond, selects, from HDD in the power-saving state in the access command-targeted LU, one or more HDD, which are capable of transitioning to the access-enabled state using power in a range of usable power values, and which can make a response possible, as a target to be preferentially transitioned to the access-enabled state.

Abstract: To reduce the performance degradation of storage system, this invention provides a storage system comprising a disk drive and a disk controller. The disk controller provides a storage area of the disk drive to a host computer; executes a processing of switching an encryption key that is used to encrypt data stored in the logical volume from a first encryption key to a second encryption key; encrypts write data requested to be written with the second encryption key when the write request for one of storage areas within the logical volume that stores data for which switching of encryption keys has not been finished is received while the encryption key switching processing is being executed; and writes the encrypted write data in the logical volume to switch encryption keys for data stored in the storage area where the data is requested to be written by the received write request.

Abstract: The amount of data of presence information delivered from a presence server to a terminal is reduced by letting the presence server discard part of the presence information depending on communication measures and data type available to the terminal, by which the amount of data processed by the terminal is reduced. The presence server fetches terminal information stored therein based on terminal information contained in a presence inquiry request message from a user and thereby learns the type of data that can be processed by the terminal of the user. The presence server reconstructs the presence information of a referred user into information that can be processed by the terminal, and sends the information to the application of the terminal. By reducing the amount of presence data transmitted from the presence server to the terminal, the amount of data to be processed by the terminal can be cut down.

Abstract: Provided is a storage control unit capable of, even when a failure occurs in access from a control unit to storage devices and the access from the control unit to the storage devices is switched to access via an alternate path, continuing I/O access to the storage devices without interrupting I/O requests from a host. The present invention provides a storage control unit having dual control units wherein a controller in one control unit, that has received an I/O request from a host, issues an I/O request to an initiator in another control unit using a control path between the controllers in the control units, and the initiator that has received this I/O request accesses the target storage device(s) via a connection path based on that I/O request.

Abstract: Provided is a storage system including: a first interface connected to a host computer; a second interface connected to a manager terminal; a control unit connected to the first interface and the second interface and equipping a processor and a memory; and one or more disk drives in which data that is requested to read by the host computer is stored, in which the control unit detects an access from the host computer to the first interface and an access from the manager terminal to the second interface, and generates log data of operations according to the accesses. Accordingly, log data concerning every action and every operation of the storage system is maintained and stored.

Abstract: Proposed are a storage controller equipped with an encryption function, a data encryption method, and a storage system enabling a user to apply one's desired encryption policy to data received from a computer or the like. This storage controller includes a storage apparatus for storing data from a computer, and a controller for controlling the input and output of data stored in the storage apparatus. The controller has a configuration information management unit for managing configuration information of attributes concerning an encryption function as information for encrypting data, and an encryption execution unit for performing encryption of data from the computer and data stored in the storage apparatus based on the configuration information of attributes concerning the encryption function.

Abstract: The storage control device of the present invention suppresses a drop in the performance of a host and storage control device by preventing the execution of encryption processing in the host and storage control device. The user presets an attribute that relates to the encryption of each storage device by considering the type of data transmitted from a higher order device (encryption data or plain data, for example) and the importance of the data and so forth. Such user operating policies are registered in a configuration management section via a setting section. When the data received from the higher-level device are encryption data, the storage control device stores the data in the storage device as is without performing encryption processing. When the received data are plain data, the storage control device converts the plain data into encryption data by performing encryption processing and stores the encryption data in the storage device.

Abstract: Provided is a storage control unit capable of, even when a failure occurs in access from a control unit to storage devices and the access from the control unit to the storage devices is switched to access via an alternate path, continuing I/O access to the storage devices without interrupting I/O requests from a host. The present invention provides a storage control unit having dual control units wherein a controller in one control unit, that has received an I/O request from a host, issues an I/O request to an initiator in another control unit using a control path between the controllers in the control units, and the initiator that has received this I/O request accesses the target storage device(s) via a connection path based on that I/O request.

Abstract: Provided is a storage system including: a first interface connected to a host computer; a second interface connected to a manager terminal; a control unit connected to the first interface and the second interface and equipping a processor and a memory; and one or more disk drives in which data that is requested to read by the host computer is stored, in which the control unit detects an access from the host computer to the first interface and an access from the manager terminal to the second interface, and generates log data of operations according to the accesses. Accordingly, log data concerning every action and every operation of the storage system is maintained and stored.

Abstract: The amount of data of presence information delivered from a presence server to a terminal is reduced by letting the presence server discard part of the presence information depending on communication measures and data type available to the terminal, by which the amount of data processed by the terminal is reduced. The presence server fetches terminal information stored therein based on terminal information contained in a presence inquiry request message from a user and thereby learns the type of data that can be processed by the terminal of the user. The presence server reconstructs the presence information of a referred user into information that can be processed by the terminal, and sends the information to the application of the terminal. By reducing the amount of presence data transmitted from the presence server to the terminal, the amount of data to be processed by the terminal can be cut down.

Abstract: A database link control method and apparatus capable of establishing a link between records related to each other and a database system including a database control function. The data base system includes a function for storing information regarding at least one record and a link relating records to each other holds at least one link generating information item necessary to generate a link to relate records to each other. The database system includes a database server including a storage to store information regarding at least one record and a storage to store links relating records to each other and a database client. The client holds at least one link generating information item necessary to generate a link to relate records to each other.