Figure 5-59 iSCSI Configuration The following parameters can be updated: Important:  If you change the name of the system after iSCSI is configured, you might  need to reconfigure the iSCSI hosts. It is important to set the system name correctly because it is part of the IQN for the node. To change the system name, click the system name and specify the new name. System name : You can use the letters A - Z and a - z, the numbers 0 - 9, and the  underscore (_) character. The name can be 1 - 63 characters. An  iSCSI alias  is a user-defined name that identifies the node to the host. Complete the  following steps to change an iSCSI alias: Each node has a unique iSCSI name that is associated with two IP addresses. After the  host starts the iSCSI connection to a target node, this IQN from the target node is visible in  the iSCSI configuration tool on the host. You can specify the IP address for the iSCSI Storage Name Service (iSNS). Host systems  use the iSNS server to manage iSCSI targets and for iSCSI discovery. You can also enable Challenge Handshake Authentication Protocol (CHAP) to  authenticate the system and iSCSI-attached hosts with the specified shared secret. The CHAP secret is the authentication method that is used to restrict access for other  iSCSI hosts that use the same connection. You can set the CHAP for the whole system  under the system properties or for each host definition. The CHAP must be identical on  the server and the system/host definition. You can create an iSCSI host definition without  the use of a CHAP. 168  Implementing the IBM Storwize V7000 with IBM Spectrum Virtualize V8.2.1 GLYPH<SM590000> iSNS and CHAP b. Specify a name for it. a. Click an iSCSI alias.  GLYPH<SM590000> iSCSI Aliases (Optional) GLYPH<SM590000> System Name