| http://www.w3.org/ns/prov#value | - First, a shown in FIG. 9 is calculated a is an addition of a maximum time taken for the update information reflecting program a to inform the standard time to the update information reflecting units a in all the secondary disk systems 300 and a time difference between a timer of the primary CPU and a timer of the secondary CPU. The minimum margin is a multiplied by a safety factor (>1).
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