Patent ID: 9619154
Date: 2017-04-11
CPC Classifications: G06F

Claim:
1. A data management method in a computer system including a host computer configured to transmit a first write command of first data of a data object that specifies a first address of a virtual volume which is a virtual logical volume including a plurality of virtual pages and a storage apparatus configured to include a tiered storage area including a plurality of storage tiers formed by a plurality of real page groups having different input/output performance and where one or more first real pages from the real page groups of the plurality of storage tiers are allocated to one or more virtual pages of the virtual volume, the data management method comprising: before writing, by the host computer, the first data of the data object of the first write command to the virtual volume and when a first real page of the real pages is allocated to a first virtual page of the virtual pages corresponding to the address and a size of the data object specified by the first write command, transmitting, by the host computer, a change command to the storage apparatus to change a second real page of the real pages that is allocated to a second virtual page of the virtual pages of the virtual volume which logically follows the first virtual page to a third real page of the real page groups in the storage tiers having a predetermined higher input/out performance than the second real page; receiving, by the storage apparatus, the change command; changing, by the storage apparatus, the second real page allocated to the second virtual page to the third real page of the real page groups in the storage tiers having the predetermined higher input/output performance than the second real page according to the change command; transmitting the first write command to the storage apparatus after transmitting the change command; and writing the first data of the data object corresponding to the second virtual page in the third real page allocated to the second virtual page.