Abstract: A highly-reliable computer apparatus and path management method capable of reducing the impact of a failure in a physical I/O device on the entire virtual computer system is suggested. If a first path management unit detects a failure in a virtual HBA, it notifies a second path management unit of the failure; and in response to the failure notice, the second path management unit gives an instruction to the first path management unit corresponding to each virtual computer having another virtual HBA that uses a physical HBA corresponding to the virtual HBA in which the failure has been detected, to block the other virtual HBA; and if the first path management unit receives the instruction from the second path management unit to block the virtual HBA, it blocks the designated virtual HBA.

Abstract: Provided is a method of controlling a computer system that includes: a computer; a first storage device connected to the computer via a first path and a second path; and a second storage device externally-connected to the first storage system via a third path and connected to the computer via a fourth path, the first storage device providing a first storage area to the computer, the second storage device including a second storage area corresponding to the first storage area, the method including: judging whether or not a fault has occurred in at least one of the first to fourth paths; selecting, a path used for access to the first or second storage area; and transmitting the access request for the first or second storage area by using the selected path. Accordingly, in the computer system, an application can be prevented from being stopped despite a fault in a path.

Abstract: A management device that manages a plurality of electronic devices constituting a storage system specifies a power effect unit, through which a path that cannot be closed does not pass, from among a plurality of power effect units present in the storage system (units whose power states are switched independently), and causes the power state of the power effect unit to be transitioned to a power savings state by closing the path passing through the power effect unit. The power effect units are units, the power states of which are switched independently, and are the electronic devices themselves or a part thereof.

Abstract: Provided is a method of controlling a computer system that includes: a computer; a first storage device connected to the computer via a first path and a second path; and a second storage device externally-connected to the first storage system via a third path and connected to the computer via a fourth path, the first storage device providing a first storage area to the computer, the second storage device including a second storage area corresponding to the first storage area, the method including: judging whether or not a fault has occurred in at least one of the first to fourth paths; selecting, a path used for access to the first or second storage area; and transmitting the access request for the first or second storage area by using the selected path. Accordingly, in the computer system, an application can be prevented from being stopped despite a fault in a path.

Abstract: A plurality of storage devices connected to at least one host computer via a network is to be managed. Access information about accesses from the host computer to each of the storage devices is referred to; a storage area in the storage device that has low access efficiency is determined based on the access information; a host computer having low access efficiency in view of the storage area having low access efficiency is determined based on the access information; a storage area having high access efficiency at least from the host computer having low access efficiency is determined; and data that is stored in the storage area having low access efficiency and used by the host computer having low access efficiency is transferred to the storage area having high access efficiency.

Abstract: A plurality of storage devices connected to at least one host computer via a network is to be managed. Access information about accesses from the host computer to each of the storage devices is referred to; a storage area in the storage device that has low access efficiency is determined based on the access information; a host computer having low access efficiency in view of the storage area having low access efficiency is determined based on the access information; a storage area having high access efficiency at least from the host computer having low access efficiency is determined; and data that is stored in the storage area having low access efficiency and used by the host computer having low access efficiency is transferred to the storage area having high access efficiency.

Abstract: A plurality of storage devices connected to at least one host computer via a network is to be managed. Access information about accesses from the host computer to each of the storage devices is referred to; a storage area in the storage device that has low access efficiency is determined based on the access information; a host computer having low access efficiency in view of the storage area having low access efficiency is determined based on the access information; a storage area having high access efficiency at least from the host computer having low access efficiency is determined; and data that is stored in the storage area having low access efficiency and used by the host computer having low access efficiency is transferred to the storage area having high access efficiency.