what is SCSI DEVICE? rfc 没看明白，求教

Question

最近可能要实现iscsi && scsi ,看 rfc,很多不明白。，求教
   
- SCSI Device: This is the SAM2 term for an entity that contains one
     or more SCSI ports that are connected to a service delivery
     subsystem and supports a SCSI application protocol.  For example, a
     SCSI Initiator Device contains one or more SCSI Initiator Ports and
     zero or more application clients.  A Target Device contains one or
     more SCSI Target Ports and one or more device servers and
     associated logical units.  For iSCSI, the SCSI Device is the
     component within an iSCSI Node that provides the SCSI
     functionality.  As such, there can be at most, one SCSI Device
     within a given iSCSI Node.  Access to the SCSI Device can only be
     achieved in an iSCSI normal operational session.  The SCSI Device
     Name is defined to be the iSCSI Name of the node

"As such, there can be at most, one SCSI Device
     within a given iSCSI Node." 这句没明白。 一个iscsi结点，只能有一个scsi设备么？