Patent ID: 7890713
Filing Date: 2011-02-15
Classification: G06F

Abstract:
1. A storage apparatus comprising: a plurality of disk devices configuring at least one logical volume for storing data used by a host apparatus, a controller to provide at least one virtual volume to the host apparatus, and to dynamically allocate a storage area with a necessary capacity from among one or more storage areas of the virtual volume in response to a write access request from the host apparatus; and a memory storing information of access attributes set for storage areas, respectively, wherein a storage area size of the storage area included in the storage areas, is smaller than a size of the logical volume or the virtual volume, wherein the controller sets an access attribute and a normalization threshold for each storage area in response to the write access request, wherein the controller executes normalization for at least two storage areas having a first access attribute, in which the controller collectively migrates data stored in the storage areas to a normalization volume, based on a data migration criterion related to the normalization threshold of each storage area, and wherein the controller sets the first access attribute to the normalization volume after the normalization, wherein the access attribute is set by a system administrator for every write access request from the host apparatus.