Storage system and management method thereof

A storage system, comprising:

• a storage apparatus having a real volume formed in a storage medium holding a data entity to be handled in a host computer;
• a first storage controller connected to the storage apparatus and configured to control the storage apparatus;
• a second storage controller connected to the storage apparatus and configured to control the storage apparatus;
• and
• a management apparatus connected to the storage apparatus, the first storage controller and the second storage controller, and configured to manage the storage apparatus, the first storage controller and the second storage controller,
• wherein the first storage controller includes a first virtual volume associated with the real volume, the first virtual volume being provided to an application program in the host computer,
• wherein the second storage controller includes a second virtual volume associated with the real volume, the second virtual volume being provided to an application program in the host computer and having a pair relationship with the first virtual volume, and
• wherein the management apparatus receives a setting request of an attribute of a function related to the first virtual volume directed to the first storage controller via the user interface, and uses the setting request to set the attribute;
• wherein the management apparatus compares an attribute of a first function related to the first virtual volume and an attribute of a second function related to the second virtual volume;
• wherein, if the acquired attribute of the first function and the acquired attribute of the second function differ, the management apparatus outputs information concerning a difference to the user interface;
• and
• wherein the management apparatus uses the result of the comparison to set the attribute of the second function related to the second virtual volume to be consistent with the attribute of the first function related to the first virtual volume, for the first virtual volume and the second virtual volume having the pair relationship;
• and
• wherein, after the set the attribute operation, the management apparatus determines whether the first virtual volume and the second virtual volume have been each set normally, and when at least one of the first virtual volume and the second virtual volume could not be set normally, commands restoration of the first virtual volume or the second virtual volume that has set normally, to a state before the set the attribute operation.