US 2013/0212345 A1Published application

Storage system with virtual volume having data arranged astride storage devices, and volume management method

AssigneeHitachi, Ltd.

InventorAkio Nakajima

Life of this patent

Estimating the term…

Loading patent…

Abstract

A virtual LU astride a plurality of storage devices is a virtual volume composed of a plurality of partial volumes. Functions of the storage system, Zoning information of a SAN and a host group information of the virtual volume are inherited to a partial volume created for each physical device. When a page granularity data migration is executed, volume or data are migrated to other storage devices without depending on the relationship between a physical port and the physical device. When a host IO request is received when migration is on-going, response processing is performed by synchronizing storage devices within the range of migration data. The host IO request related to the page being migrated sends a partial complete response including information for re-routing the request to a path of the appropriate data migration destination device capable of issuing the IO.

Claims15

Dependent claims

A storage system comprising a host, a first storage device providing a volume to the host, and a second storage device, which are mutually coupled, wherein

the first storage device and the second storage device each stores a volume information for managing the volume and an access information for managing the access among said mutually coupled storage devices;
wherein the first storage device
receives an order to distribute the volume from the host;
updates access information by referring to the order;
transmits the updated access information to the second storage;
creates a first partial volume constituting a portion of the distributed virtual volume in the first storage device by referring to the volume information and the updated access information;
migrates a portion of the volume to the second storage device;
creates a second partial volume constituting a portion of the distributed virtual volume by referring to the volume information and the updated access information;
wherein the second storage device
establishes a coupling between the host, the first storage device and the second storage device by referring to the updated access information;
and
wherein the host issues an IO to the distributed virtual volume by referring to the updated access information.

9 more elements

A volume management method of a storage system comprising a host, a first storage device providing a volume to the host, and a second storage device, which are mutually coupled, the method comprising:

a step of transmitting an order to distribute the volume from the host to the first storage device;
a step of updating an access information for managing the access among coupled storage devices that the first storage device stores by referring to the order;
a step of transmitting the updated access information from the first storage device to the second storage device;
a step of creating a first partial volume constituting a portion of the distributed virtual volume in the first storage device by referring to the volume information managing the volume and the updated access information stored in the first storage device;
a step of migrating a portion of the volume from the first storage device to the second storage device;
a step of creating a second partial volume constituting a portion of the distributed virtual volume in the second storage device by referring to the volume management information and the updated access information stored in the second storage device;
a step of establishing a coupling between the host, the first storage device and the second storage device by referring to the updated access information;
and
transmitting an IO from the host to the distributed virtual volume by referring to the updated access information.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/391,477Filed 10 Feb 2012
Published: 15 Aug 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

G06F 3/061
Specifically adapted to achieve a particular effect: improving I/O performance
G06F 3/0605
Improving or facilitating administration, e.g. storage management: by facilitating the interaction with a user or administrator
G06F 3/0617
Improving the reliability of storage systems: in relation to availability
G06F 3/0619
Improving the reliability of storage systems: in relation to data integrity, e.g. data losses, bit errors