Virtualization controller, access path control method and computer system

A virtualization controller which is connected to one or a plurality of storages and one or a plurality of host computers, comprising:

• a plurality of ports connected to one or both of said host computer and said storage;
• and
• one or a plurality of storage controllers,
• wherein each of said ports and said storage controllers comprises:
• a virtualization processor which holds corresponding information between first identification information and second identification information, said first identification information being used for said host computer to access a storage area held by said storage, and said second identification information being used for said virtualization controller to identify said storage area, converts based on said corresponding information data having the first identification information received from the host computer into data having the second identification information, transfers the data thus converted to a storage having said storage area, converts data having the second identification information received from said storage into data having the first identification information, and transfers the data thus converted to said host computer,
• said virtualization processor comprises:
• access path management information which registers a first port controlled by said host computer, a second port connected to said storage, and said virtualization processor, as an access path for each storage area of said storage, and
• wherein when a request for changing said access path is received, said access path management information is updated, and data send/receive control is carried out between the host computer and the storage area of the storage by use of a new access path,
• said virtualization controller further comprising:
• a third port which is connected to a management server,
• wherein:
• management information by access type is held as control information regarding an access path change received from said management server via said third port,
• a type of individual access request of a storage area of said storage is determined,
• said type of access request is held and managed as access history management information by storage area,
• said access path management information is updated based on said management information by said access type and said access history management information, and the data send/receive control is carried out between said host computer and the storage area of said storage by use of a new access path.

A computer system comprising:

• one or a plurality of storages;
• one or a plurality of host computers;
• and
• a virtualization controller,
• said one or a plurality of storages, said one or a plurality of host computers, and said virtualization controller are connected to each other,
• wherein;
• said virtualization controller comprises:
• a plurality of ports connected to one or both of said host computer and said storage, and
• one or a plurality of storage controllers,
• wherein:
• each of said ports and said storage controllers comprises:
• a virtualization processor which holds corresponding information between first identification information and second identification information, said first identification information being used for said host computer to access a storage area held by said storage, and said second identification information being used for said virtualization controller to identify said storage area, converts based on said corresponding information data having said first identification information received from the host computer into data having said second identification information, transfers the data thus converted to a storage having said storage area, converts data having the second identification information received from said storage into data having the first identification information, and transfers the data thus converted to the host computer,
• wherein said virtualization controller comprises:
• access path management information which registers a first port connected to said host computer, a second port connected to said storage, and said virtualization processor, as an access path for each storage area of said storage,
• wherein when a request for changing said access path is received, said access path management information is updated, and data send/receive control is carried out between the host computer and the storage area of the storage by use of a new access path, and
• wherein said virtualization processor determines a type of access to a storage area being requested by an access request, manages information of the type of access being requested as access history management information and changes to said new access path based on said access history management information.