Data migration method for disk apparatus
AssigneeHitachi, Ltd.
InventorsKoichi Okada, Akiyori Tamura
Life of this patent
Estimating the term…
Abstract
Data migration can be executed between new and old disk apparatuses without changing the disk definition of a host computer. A switch having the function of online data migration is provided between the host computer and the old disk apparatus, data are copied to the new disk apparatus while the disk apparatus is accessed continuously by the host computer. If a SCSI command for identifying disk apparatuses is issued by the host computer after data migration, the response of the old disk apparatus is sent back.
Claims36
A method of controlling data transfer in a switch system coupled to a host system and a plurality of storage devices, the host system using logical unit identification information of a logical unit to access the switch system, and each of the storage devices having a plurality of disk drives, the method comprising:
- a first status comprising:
- receiving data of a first data input request, the first data input request being sent from the host system and being targeted to the logical unit identification information, and
- transferring the data of the first data input request to a first storage device of the storage devices so that the first storage device inputs the data of the first data input request into a storage area of the disk drives of the first storage device;
- a second status comprising:
- transferring data stored in the first storage device to a second storage device of the storage devices,
- a third status comprising:
- receiving data of a second data input request, the second data input request being sent from the host system and being targeted to the logical unit identification information, and
- transferring the data of the second data input request to the second storage device so that the second storage device inputs the data of the second data input request into a storage area of the disk drives of the second storage device,
- wherein the second status is conducted between the first status and the third status, and
- wherein the switch system controls to allow or deny to authorize a reserve to the host system based on whether another host system has the reserve authority of the logical unit of the logical unit identification information.
A method of controlling data transfer in a switch system coupled to a host system and a plurality of storage devices, the host system using an identification information to access the switch system, and each of the storage devices having a plurality of disk drives, the method comprising:
- receiving data of a first data input request, the first data input request being sent from the host system and being targeted to the identification information;
- transferring the data of the first data input request to a first storage device of the storage devices so that the first storage device inputs the data of the first data input request into a storage area of the disk drives of the first storage device;
- transferring data stored in the first storage device to a second storage device of the storage devices;
- receiving data of a second data input request, the second data input request being sent from the host system and being targeted to the identification information;
- and
- transferring the data of the second data input request to the second storage device so that the second storage device inputs the data of the second data input request into a storage area of the disk drives of the second storage device;
- and
- controlling to allow or deny to reserve a logical unit for the host system based on whether the logical unit is reserved for another host system.
A method of controlling data transfer in a switch system coupled to a host system and a plurality of storage devices, the host system using an identification information to access the switch system, and each of the storage devices having a plurality of disk drives, the method comprising:
- receiving data of a first data input request, the first data input request being sent from the host system and being targeted to the identification information;
- transferring the data of the first data input request to a first storage device of the storage devices so that the first storage device inputs the data of the first data input request into a storage area of the disk drives of the first storage device;
- transferring data stored in the first storage device to a second storage device of the storage devices;
- receiving data of a second data input request, the second data input request being sent from the host system and being targeted to the identification information;
- transferring the data of the second data input request to the second storage device so that the second storage device inputs the data of the second data input request into a storage area of the disk drives of the second storage device;
- and
- controlling to allow or deny to reserve a storage target for the host system.
Dependencies are inferred from the claim text.