Patent 7290259 was granted and assigned to Hitachi on October, 2007 by the United States Patent and Trademark Office.
A virtual computer system including a reallocation means, in which a plurality of LPAR are operated by logically dividing physical resources composing a physical computer exclusively or in time dividing manner so as to dynamically change reallocation of physical resources among each of LPARs. Based on load conditions measured by an application or an OS of each LPAR, physical resource allocation to each LPAR is determined, thereby conducting reallocation of LPAR.