HP StorageWorks 1606 Brocade Web Tools Administrator's Guide v6.3.0 (53-100134 - Page 237

iSCSI service overview 15 Terminology iSCSI target gateway services require you to understand some additional terminology. Following are terms that are used in this document to explain how the iSCSI target gateway is implemented. TABLE 17 iSCSI gateway services terminology Term Definition iSCSI iSCSI target gateway iSCSI port iSCSI virtual target Internet-SCSI. A transport carrier of the SCSI protocol over IP. An intermediate device in the network that allows the iSCSI initiators in an IP SAN to access and utilize storage in a Fibre Channel SAN. the FC4-16IP AP blade in a Brocade 48000 director functions as an iSCSI target gateway. A special GbE port used for iSCSI only. A Fibre Channel virtual initiator is created behind each iSCSI port running as a proxy Fibre Channel initiator. A unique target device in the IP SAN that contains LUNs from the real Fibre Channel targets and is identified by an IQN. iSCSI initiator iSCSI session LUN mapping A device that begins an iSCSI transaction by issuing a command to another device (the iSCSI target), giving it a task to perform. Typically, an iSCSI host adapter is the initiator but targets can also become initiators. An iSCSI session is the basic communication "pipe" from an iSCSI initiator to an iSCSI target. A session is a group of TCP/IP connections that link an initiator with a target (loosely equivalent to a SCSI I-T nexus). Logical Unit Number mapping. The mapping of the virtual iSCSI target and the physical Fibre Channel target One frontend LUN (VT LUN) maps to a backend LUN (Fibre Channel LUN). The frontend LUN numbers can be different from the backend LUN numbers. Fibre Channel LUN The LUN identifier of the Fibre Channel target. VT LUN Virtual target LUN. The LUN identifier of the iSCSI virtual target. Fibre Channel virtual initiator discovery domain (DD) (FC-VI) The iSCSI port looks like an F_Port to the rest of the system. There is one Fibre Channel virtual initiator per iSCSI. The Fibre Channel proxy initiator solution is used. FC-VI registers to the Name Server with its symbolic port name (PWWN) and node name (NWWN). The FC-VI in the Name Server entry is created irrespective of the host connectivity. Created between and iSCSI host and iSCSI targets using their IQN for the purpose of iSCSI device access control. discovery domain set (DDSet) CHAP authentication IQN GbE port Created using DDs. Can be configured to enable or disable the configuration for the purpose of iSCSI device access control. Authenticates the initiators against a list of user names and passwords with CHAP (Challenge Handshake Authentication Protocol) authentication in either one-way or mutual. An iSCSI Qualified Name that indicates an iSCSI node name in a form that is of human readable notation using the following syntax: iqn.yyyy-mm.: Gigabit Ethernet port. Uses a copper CAT-5e cable for an IP connection to an RJ-45 copper connector. FC4-16IP has 8 ports of this type that support 1 Gbps speed. PDU Protocol Data Unit. A unit of data with a header and an optional data section. For additional information about iSCSI target gateway, refer to the Fabric OS Administrator's Guide. Web Tools Administrator's Guide 205 53-1001343-01