| http://www.w3.org/ns/prov#value | - Furthermore, from the viewpoint of data recovery at the time of a disaster, there is a problem that data which are left in the disk array device and which have not been transferred yet are lost because of a fault of a primary site (main site), and it is impossible to know assured data after takeover to a secondary site (back-up site) is conducted and operation is started in the secondary site.
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