Storage system and virtualization method
AssigneeHitachi, Ltd.
InventorsYoshihito Nakagawa, Satoru Ozaki
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Abstract
The storage system of the present invention is able to generate one virtual logical device from different logical devices which exist in each of the different storage control units and remote-copy all or part of the virtual logical device to another logical device. The same virtual identifier is set for a volume of the first storage unit and for a volume of the second storage unit. The path control unit of the host identifies a plurality of volumes which have the same virtual identifier as one virtual volume. A remote copy pair can also be set by a virtual volume and a volume of the third storage unit. The setting of the virtual volume and the setting of the remote copy can be performed by means of an instruction from the management server.
Claims15
A storage system, comprising:
- a host computer;
- a plurality of storage units which are configured to be utilized by the host computer, including a first storage unit comprising a first logical volume configured to be accessed by the host computer via a first access path, and a second storage unit comprising a second logical volume configured to be accessed by the host computer via a second access path, and a third storage unit comprising a third logical volume;
- and
- a management device configured to transmit first management information, which includes a virtual identifier of a virtual volume, a first identifier of the first logical volume as a copy source volume, and a second identifier of the second logical volume as copy destination volume, to either the first storage unit or the second storage unit to virtualize the first logical volume and the second logical volume as one virtual volume by setting the first logical volume and the second logical volume as a pair, and setting the virtual identifier for both of the first logical volume and the second logical volume,
- wherein the management device is configured to transmit second management information, which includes the virtual identifier of the virtual volume as a remote copy source volume and a third identifier of the third logical volume as a remote copy destination, to either the first storage unit or the second storage unit to set a remote copy pair between the third logical volume and the virtual volume, which is virtualized by the first local volume and the second logical,
- wherein the host computer is further configured to control logical volume access via one of the first access path and the second access path to be switched to the other of the first access path and second access path, in response to a fault preventing access to the logical volume configured to be accessed by the host computer via said one of the first access path and the second access path, and
- wherein data in the first logical volume and data in the second logical volume are synchronized with each other.
Dependencies are inferred from the claim text.