Abstract: A storage system includes a plurality of nodes, each of the nodes including a nonvolatile storage device, and a connection unit directly connected to at least one of the nodes. The connection unit is configured to determine a target node responsive to a write request generated by a host, determine whether or not the target node is busy, output a write command directed to a non-busy node such that data requested by the write request are written in the non-busy node, responsive to determining that the target node is busy, and output a copy command directed to the non-busy node such that the data written in the non-busy node are copied to the target node, after a reference time period has passed since determining that the target node is busy.

Abstract: A storage system includes a plurality of storage devices, and a server including a memory and an interface. The server is configured to store, in the memory, each of data pieces that are received through the interface from a client as a series of data to be written, in association with a single write command or a series of write commands received through the interface from the client, for each data piece, determine a target storage device and a logical address thereof at which the data piece is to be written, based on an identifier of the data piece received in association with the data piece through the interface from the client, and carry out, in parallel, writing of the data pieces stored in the memory at the determined logical addresses.

Abstract: The second communication device is in one level higher in a logical network forming a tree structure and sends data to the first communication device. The third communication device is in two or more levels higher in the logical network. The third device is configured to send data to the first communication device without passing through the second communication device. The first communication devices comprises a monitoring unit and a connection switching unit. The monitoring unit is configured to monitor an operation state of the second communication device. The connection switching unit is configured to send a request for sending data to the third communication device, in a case that the normal operation state of the second communication device is not confirmed by the monitoring unit.

Abstract: A data retrieval system includes a first apparatus and a second apparatus. The first apparatus includes a distributor, a processing state receptor, and a completion determiner. The distributor distributes a query to one or more devices which can retain data. The processing state receptor receives, from the second apparatus, information indicating processing states of the devices for the query. The completion determiner determines whether the query is complete from the received processing state. The second apparatus includes a transceiver, a process manager, and a processing state transmission controller. The transceiver receives a query distributed by the first apparatus and transmits the query to the devices. The process manager manages a processing state indicating whether each device completes the query on the basis of a received processing result of the query of each device. The processing state transmission controller transmits managed processing states of the query to the first apparatus.

Abstract: A storage system includes a plurality of nodes, each of the nodes including a nonvolatile storage device, and a connection unit directly connected to at least one of the nodes. The connection unit is configured to determine a target node responsive to a write request generated by a host, determine whether or not the target node is busy, output a write command directed to a non-busy node such that data requested by the write request are written in the non-busy node, responsive to determining that the target node is busy, and output a copy command directed to the non-busy node such that the data written in the non-busy node are copied to the target node, after a reference time period has passed since determining that the target node is busy.

Abstract: A storage system includes a plurality of storage devices, and a server including a memory and an interface. The server is configured to store, in the memory, each of data pieces that are received through the interface from a client as a series of data to be written, in association with a single write command or a series of write commands received through the interface from the client, for each data piece, determine a target storage device and a logical address thereof at which the data piece is to be written, based on an identifier of the data piece received in association with the data piece through the interface from the client, and carry out, in parallel, writing of the data pieces stored in the memory at the determined logical addresses.

Abstract: According to one embodiment, there is provided a database system in which a database server and a storage are connected via a communication line. The storage includes a data area, a transaction information storage area, a journal log storage area, and a first circuit. The database server includes a second circuit. The second circuit writes transaction information into the transaction information storage area determined from a combination of the subject database server and a unit of division of processing executing transaction processing.