In the context of this document, a port is an end point of the connection from a device into the iSCSI SAN. Each node in the iSCSI SAN, a host, storage device, and Ethernet switch has one or more ports that connect it to the SAN. Ports are identified in a number of ways.

IP Address

Each iSCSI port has an IP address associated with it so that routing and switching equipment on your network can establish the connection between the server and storage. This address is just like the IP address that you assign to your computer to get access to your company's network or the Internet.

iSCSI Name

A worldwide unique name for identifying the port. The iSCSI name starts with either iqn. (for iSCSI qualified name) or eui. (for extended unique identifier). Multiple iSCSI devices can be present, with multiple iSCSI names, and can be connected through a single physical Ethernet port.

By default, ESX/ESXi generates unique iSCSI names for your iSCSI initiators, for example, iqn.1998-01.com.vmware:iscsitestox-68158ef2. Usually, you do not have to change the default value, but if you do, make sure that the new iSCSI name you enter is worldwide unique.

iSCSI Alias

A more manageable name for an iSCSI device or port used instead of the iSCSI name. iSCSI aliases are not unique and are intended to be just a friendly name to associate with a port.