| 摘要 |
A plurality of NAS heads 1 to 4 can access a shared LU 18 which stores a shared resource 21 and a count value for the NAS head 1 . The NAS head 1 comprises a use resource registration/delete section 35 which accesses the shared resource 21 if the shared resource is in unused status, and does not access the shared resource 21 if the shared resource 21 is used by another NAS head 2 to 4 , and a reset section 39 for resetting the count value to zero. The NAS head 2 cancels the use status and release the shared resource 21 to the unused status if the count value exceeds a predetermined threshold and the shared resource 21 remains in use status being used by the NAS head 1 . Exclusive control for using a shared resource is performed.
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