Patent ID: 9342418
Filing Date: 2016-05-17
CPC Classification: G06F

Claim Text:
1. A storage system that transfers sequentiality-guaranteed data from a first storage device to a second storage device connected via a network, comprising: two or more redundant receiving buffers that are respectively disposed in two or more redundant control devices in the second storage device and store data redundantly; a session managing unit that manages a copy session state representing whether there is consistency of a copy state of the sequentiality-guaranteed data between the first storage device and the second storage device; and a buffer managing unit that manages a buffer data lost state representing that the sequentiality-guaranteed data has been lost in any of the two or more redundant receiving buffers, wherein when a factor that causes the second storage device to stop processing of the storage system is multiple failures in two or more redundant control devices during a process of developing data in a storage medium of the second storage device, the session managing unit sets inconsistency as the copy session state and also the buffer managing unit sets the buffer data lost state, and when a data transfer process is resumed between the first storage device and the second storage device and when the buffer data lost state is set by the buffer managing unit, the session managing unit sets consistency as the copy session state.