Patent ID: 8065430
Filing Date: 2011-11-22
Classification: G06F,H04L

Abstract:
1. A storage system coupled to a host computer via an IP network and including a storage unit storing data, comprising: a communication controller—(an initiator)—configured to communicate with another storage system—(a target)—via the IP network using iSCSI protocol, and to send one or more check commands to the other storage system for checking information of one or more logical units in the other storage system, wherein, the communication controller is configured to simultaneously send to the target a plurality of check commands, wherein when a number of delayed ACKs for delaying responses to the target is set to more than one, the number of the plurality of check commands is set to the same number of the delayed ACKs, or set to a multiple number of the delayed ACKs; wherein when the number of delayed ACKs for delaying responses to the target is set to one, the number of the check command is one; wherein when receiving check results in response to the check commands from the target, the communication controller is configured to send an ACK to the target, and when no check result has been received, then the communication controller waits for an inquiry response; and wherein the communication controller is configured to increase or decrease the number of the plurality of check commands to be sent simultaneously on the basis of the number of networks existing between the communication controller and the target.