Patent ID: 6542924
Filing Date: 2003-04-01
Classification: G06F

Abstract:
A disk array clustering system comprising:a disk array; a master server and a slave server both for transmitting SCSI commands to respective associated controllers of said disk array; a monitoring client and a plurality of user clients connected with said disk array through said master server and said slave server, said monitoring client having a manager program as a control software for controlling said disk array, said master server and said slave server having respective identical agent programs for receiving instructions from said manager program, issuing instructions to said disk array based upon instructions received from the manager program, and transmitting information received from said disk array to said manager program; said disk array further including a server transition judgment section for monitoring SCSI commands received by each controller, and when a SCSI command is received by a controller which until then has been received by another controller, sending an alert to the agent program in a server which has newly sent the SCSI command; each of said respective agent programs further including means, when receiving said alert, for recognizing that said respective agent program has been activated by the switching of the servers, and informing said manager program of this fact; and said manager program further including means for informing said monitoring client of the switching of servers.