Storage apparatus and data management method for storage area allocation based on access frequency

摘要

Provided are a storage apparatus and data management method with which the usage ratio of each of the storage tiers is determined beforehand for each virtual volume and data can be managed by being migrated between storage tiers within a range of predetermined usage ratios.;A storage apparatus 5, comprising storage devices 30 of a plurality of types of varying performance; and a controller 31 which manages each of storage areas provided by the storage devices 30 of a plurality of types by means of storage tiers ST of a plurality of different types respectively, and which assigns the storage areas in page units to virtual volumes VVOL from any storage tier among the storage tiers ST of a plurality of types, the controller 31 managing usage ratios of the storage tiers ST of a plurality of types and assigning the storage areas in page units to the virtual volumes VVOL based on the usage ratio managed.

主权项

1. A storage apparatus coupled to a host computer, the storage apparatus comprising:
storage devices of a plurality of types of varying performance, each of the storage devices belonging to one tier of a plurality of tiers according to a type of the storage devices; and a controller, which is communicably connected to an external terminal, wherein the controller is configured to:
manage the storage devices of a same type as storage tiers of the same type;provide a virtual volume to the host computer;allocate a storage area provided by the storage devices of the storage tiers to a page of the virtual volume;manage a usage ratio of tiers indicated by the external terminal and predetermined for the virtual volume; anddetermine locatable capacity of each storage tier for the virtual volume by using the usage ratio of tiers,wherein the storage area allocated to the page is determined based on an access frequency related to the page, the usage ratio of tiers, and a RAID level indicated by the external terminal and predetermined for the virtual volume.