Storage system and virtualization method

摘要

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.

主权项

1. A storage system processing an I/O request from a host, the storage system comprising:
a first storage apparatus processing the I/O request from the host, the first storage apparatus controlling a plurality of first storage devices, the first storage apparatus configured to: manage a first volume, which is identified by a first identifier, on the plurality of the first storage devices; manage a correspondence relationship between the first identifier and a virtual volume identifier; and provide the first volume to the host as a virtual volume by responding with the virtual volume identifier to an inquiry command from the host to have the host identify the first volume as the virtual volume, a second storage apparatus processing the I/O request from the host, the second storage apparatus controlling a plurality of second storage devices, the second storage apparatus configured to: manage a second volume, which forms a remote synchronous copy pair with the first volume and is identified by a second identifier, on the plurality of the second storage devices; manage a correspondence relationship between the second identifier and the virtual volume identifier; and provide the second volume to the host as the virtual volume by responding with the virtual volume identifier to an inquiry command from the host to have the host identify the second volume as the virtual volume, a third storage apparatus controlling a plurality of third storage devices, the third storage apparatus configured to manage a third volume on the plurality of the third storage devices, wherein the storage system is configured to: configure a remote copy pair between the virtual volume and the third volume, wherein, according to a write command to the virtual volume from the host, the storage system is configured to: write data related to the write command in both the first volume and the second volume synchronously; and transfer the data from the first storage apparatus to the third storage apparatus to store the write data in the third volume, and wherein, when the storage system fails to access the first volume, the storage system is configured to: write data related to the write command in the second volume; and transfer the data from the second storage apparatus to the third storage apparatus to store the write data in the third volume.