A data transfer method and an Internet Small Computer Systems Interface
controller are disclosed. At least one mirror iSCSI controller is preset
for each iSCSI controller. The mirror iSCSI controller detects failure of
the mirrored iSCSI controller corresponding to the mirror iSCSI
controller, and adds service information of the mirrored iSCSI controller
to the mirror iSCSI controller. The mirror iSCSI controller receives a
log-in request sent from an iSCSI host which originally has logged in the
mirrored iSCSI controller. The mirror iSCSI controller conducts data
transfer with the iSCSI host in accordance with the service information.
