Patent ID: 7434094

Claim:
A remote copy processing method having a first RAID device connected to a host and a second RAID device connected to the first RAID device via an inter-device path, for establishing a session according to a copy instruction from the host and based on session information, and transferring and copying entire or partial data of a primary volume of the first RAID device which is specified as a copy source to the same position of a secondary volume of the second RAID device which is specified as a copy destination through the inter-device path, the remote copy processing method comprising: a copy source session releasing step in which the host instructs the first RAID device of forcible stop of the session so as to cause the session information to be deleted when blockage of the inter-device path is recognized; and a copy destination session releasing step in which the host causes the session information remaining in the second RAID device to be deleted by an instruction given via the first RAID device when the forcibly terminated session is tried to be started when the blocked inter-device path is connected and results in an error.