Patent ID: 7725676
Filing Date: 2010-05-25
Classification: G06F

Abstract:
1. A method for controlling a system including first and second storage systems, the first storage system receiving input/output (I/O) requests from a host, and the first and second storage systems being coupled to a management system: providing a primary volume to the first storage system and a remote secondary volume to the second storage subsystem, the remote secondary volume being a copied volume of the primary volume, the primary volume and the remote secondary volume being mirrored asynchronously; providing a first storage in a queuing area of the first storage system and a second storage in a queuing area of the second storage system for storing data transferred from the first storage system to the second storage system in response to a write I/O request issued by the host to write data in the primary volume; retrieving data stored in the second storage and storing the data in the remote secondary volume; monitoring the queuing area of the first or second storage system; and sending an alert to the management system if an unused area of the queuing area of the first or second storage system is less than a predetermined amount.