Patent ID: 9417817
Filing Date: 2016-08-16
CPC Classification: G06F

Claim Text:
1. A management apparatus for managing a computer system in which a plurality of storage apparatuses are connected to each other, wherewith the computer system manages storage areas respectively provided by a first storage apparatus and a second storage apparatus included in the plurality of storage apparatuses as a logical pool that extends over the plurality of storage apparatuses, provides to a host computer a virtual logical volume that is associated with the logical pool, and dynamically assigns a storage area from the logical volume to the virtual logical volume according to usage of the virtual logical volume, wherein the host computer: is connected to the first storage apparatus via a first path, and accesses the virtual logical volume via the first path, and accesses the first storage apparatus when access-target data exists in the first storage apparatus, and accesses the second storage apparatus via a second path connecting the first storage apparatus and the second storage apparatus when access-target data exists in the second storage apparatus, wherein the host computer comprises: an access path diagnostic unit that determines whether a ratio of an access volume used by the second path exceeds a predetermined ratio, and determines that there is a problem with the access path from the host computer to the virtual logical volume i) when a residual bandwidth of a front-end port of the first storage apparatus to which the first access path is connected is less than an unused port bandwidth threshold; or ii) when a residual bandwidth of a back-end port of the first storage apparatus to which the second access path is connected between the first storage apparatus and the second storage apparatus is less than the unused port bandwidth threshold; a change destination path identification unit that identifies a third path connecting the host computer and the second storage apparatus as a change destination of the access path when it is determined that there is a problem with the access path; and an access path change unit that executes predetermined control processing for changing the third path identified by the change destination path identification unit to be a part of the access path from the host computer to the virtual logical volume in substitute for the first path.