Hitachi, Ltd.

Toshiya Kurakake

Naoki Utsunomiya

Hiroyuki Kumazaki

Kouji Sonoda

In collective I/O processing in which a plurality of processes access the same file in a shared manner, when each user process issues an I/O request, the user process notifies the system of information on a file region accessed by all the processes; information for specifying whether or not a prefetch is performed, and information for specifying whether or not a disk preallocate is performed, together with the I/O requests issued by all associated processes, as hint information. The system provides a buffer for storing data in a file region accessed by all the processes based on the hint information, such that the I/O processing for all the processes is performed using this buffer.

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Fujisawa, Japan

Toshiya Kurakake