Patent ID: 8108639
Filing Date: 2012-01-31
Classification: G06F

Abstract:
1. A storage system, comprising: a first site having a first storage device and a first host computer for reading/writing data from/into the first storage device; a second site having a second storage device and a second host computer for reading/writing data from/into the second storage device; and a management computer for managing the first host computer of the first site, wherein the first storage device performs Asynchronous Remote Copy from the first storage device of the first site to the second storage device of the second site, wherein the management computer stores a sequence number as identification information of a current latest or quasi-latest data stored in a buffer of the first storage device of the first site with temporal information of the sequence number at each of certain monitoring intervals, wherein the management computer calculates an estimated value of data recovery available time, which is a time at which data most recently stored in the second storage device of the second site that corresponds to data stored in the first storage device was stored in the first storage device, based on the temporal information stored by the management computer and based on a certain sequence number of a current earliest or quasi-earliest data or a quantity of the data stored in the buffer at a certain time, and wherein the management computer displays the estimated value on a display section.