Fujitsu Corporation

Koichi Tsukada

Tatsuhiko Machida

Shoji Oshima

Satoshi Yazawa

Hirokazu Matsubayashi

For each RAID group to be determined for blocking, each disk is classified into three types of totalization unit based on the status of each disk belonging to the RAID group or the presence/absence of an access path to each disk, and the number of disks corresponding to each totalization unit is totalized. The totalization unit is a 'used disk', an 'unused disk', and a &#x201c;loop-down disk&#x201d;. The totalization result is compared with the threshold condition set for each RAID level (for example, &#x201c;unused disk&#x201d;=0 and &#x201c;loop-down disk&#x201d;='1 or more'), and the blocking possibility is determined.

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Kawasaki, Japan

Koichi Tsukada