Patent ID: 7889639
Filing Date: 2011-02-15
Classification: G06F,H04L

Abstract:
1. A fiber channel switch multinodely arranged with respect to other fiber channel switch and having a plurality of connection terminals being respectively connected to a host computer and connected to at least one physical storage unit via fiber channels and having storage virtualization means for producing a virtual storage unit with a part or a whole of a storage area of the physical storage unit and making the host computer recognize the virtual storage unit, the fiber channel switch comprising: two first communication means for communicating with the other fiber channel switch; access adjusting means for communicating a reserve notification of the physical storage unit with the other fiber channel switch via said first communication means and adjusting a reserve state of the physical storage unit with the other fiber channel switch; means for setting a master-slave relation with the other fiber channel switch; a second communication means for communicating with the other fiber channel switch via said connection terminals, which are further connected to the other fiber channel switch via fiber channels; and means for master and/or slave processing by sending a command for blocking access between the host computer and the physical storage unit by said block control means to the other fiber channel switch via said second communication means if said fiber channel switch is set as a master by said setting means, when the communication with the other fiber channel switch via said first communication means is interrupted, or by blocking access between the host computer and the physical storage and notifying the block to the other fiber channel switch via said second communication means if said fiber channel switch is set as a slave by said setting means, when the communication with the other fiber channel switch via said first communication means is interrupted.