Abstract: A storage system is migrated without stopping service provision by a host computer. By this means, in a migration-source storage system, data of the cache memory is destaged, and, next, data received from the host computer is directly written in a logical unit by bypassing the cache memory. On the other hand, in a migration-destination storage system, communication with the migration-source storage system is performed to set setting information of a logical unit of the migration object into a logical unit management table and set a writing mode for the cache memory to a cache-bypass mode. After that, the migration-source storage system blocks a path to the host computer. The migration-destination storage system receives a report of the path block from the migration-source storage system and then opens a path between the own system and the host computer.

Abstract: The present invention enables program codes to be shared among processors 211. To prevent the debug operation of one processor 211 from affecting the debug operation of the other processors 211, when detecting a breakpoint during execution of a program code, a debugger 410 or a debugger stub 520 controls the execution of the program code while exchanging breakpoint information 800 with the other debuggers 410 or the other debugger stubs 520. Furthermore, a circuit 170 is created which prevents the program code being carelessly rewritten due to thermal runaway, a bug, and the like of a processor 211, and the protection setting by the protection logic 71 in the circuit 170 is released only in case the processor 211 accesses each of a plurality of registers from 65 to 67 in specified order.

Abstract: A storage system is migrated without stopping service provision by a host computer. By this means, in a migration-source storage system, data of the cache memory is destaged, and, next, data received from the host computer is directly written in a logical unit by bypassing the cache memory. On the other hand, in a migration-destination storage system, communication with the migration-source storage system is performed to set setting information of a logical unit of the migration object into a logical unit management table and set a writing mode for the cache memory to a cache-bypass mode. After that, the migration-source storage system blocks a path to the host computer. The migration-destination storage system receives a report of the path block from the migration-source storage system and then opens a path between the own system and the host computer.

Abstract: The present invention enables program codes to be shared among processors 211. To prevent the debug operation of one processor 211 from affecting the debug operation of the other processors 211, when detecting a breakpoint during execution of a program code, a debugger 410 or a debugger stub 520 controls the execution of the program code while exchanging breakpoint information 800 with the other debuggers 410 or the other debugger stubs 520. Furthermore, a circuit 170 is created which prevents the program code being carelessly rewritten due to thermal runaway, a bug, and the like of a processor 211, and the protection setting by the protection logic 71 in the circuit 170 is released only in case the processor 211 accesses each of a plurality of registers from 65 to 67 in specified order.

Abstract: A storage system including a plurality of logical units; file management application software for performing file management on a per-file basis for a plurality of files stored in the respective logical units; a load monitoring module for monitoring a load in a resource of the storage system; and a file management control module for controlling the file management application software based on the load monitored by the load monitoring module.

Abstract: A storage system including a plurality of logical units; file management application software for performing file management on a per-file basis for a plurality of files stored in the respective logical units; a load monitoring module for monitoring a load in a resource of the storage system; and a file management control module for controlling the file management application software based on the load monitored by the load monitoring module.

Abstract: A storage system including a plurality of logical units; file management application software for performing file management on a per-file basis for a plurality of files stored in the respective logical units; a load monitoring module for monitoring a load in a resource of the storage system; and a file management control module for controlling the file management application software based on the load monitored by the load monitoring module.

Abstract: A storage system including a plurality of logical units; file management application software for performing file management on a per-file basis for a plurality of files stored in the respective logical units; a load monitoring module for monitoring a load in a resource of the storage system; and a file management control module for controlling the file management application software based on the load monitored by the load monitoring module.