Adaptec iSA1500 User Guide - Page 19
What is iSCSI and How Does It Work?, What is iSCSI?, What’s an iSCSI Initiator?, What’s an IQN?
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Introduction to iSCSI and IPSANs What is iSCSI and How Does It Work? This section provides a general overview of iSCSI technology and explains how it's used for networking. What is iSCSI? When SCSI command blocks are encapsulated with IP and transferred over an IP network, it is known as Internet SCSI (iSCSI). iSCSI technology lets SCSI commands be carried over existing IP networks, connecting IP-based storage devices, hosts, and clients on IP Storage Area Networks (IPSANs-see page 2-5), Local Area Networks (LANs), and Wide Area Networks (WANs). What's an iSCSI Initiator? iSCSI initiators are devices that encapsulate SCSI commands and data requests into iSCSI packets for transfer across the IP network. For example, an iSCSI initiator can be a Network Interface Card (NIC) with an iSCSI layer. iSCSI requests are sent to iSCSI targets, as shown in the Figure on page 2-3. What's an iSCSI Target? iSCSI targets are devices that receive iSCSI requests from iSCSI initiators, and send iSCSI responses back to the iSCSI initiators, as shown in the Figure on page 2-3. What's an IQN? An iSCSI Qualified Name, or IQN, is a unique identifier user to differentiate iSCSI targets and initiators from each other. An IQN is similar to the World Wide Name (WWN) used in Fibre-based SANs. 2-2
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