Figure 3-17 shows an overview of the iSCSI implementation in the SAN Volume Controller. Both onboard Ethernet ports of a SAN Volume Controller node can be configured for iSCSI.  For each instance of an iSCSI target node (that is, each SAN Volume Controller node), you  can define two IPv4 and two IPv6 addresses or iSCSI network portals: iSCSI connectivity is a software feature that is provided by the SAN Volume Controller code.  The iSCSI protocol is a block-level protocol that encapsulates SCSI commands into  Transmission Control Protocol/Internet Protocol (TCP/IP) packets. Therefore, iSCSI uses IP  network rather than requiring the Fibre Channel infrastructure. The iSCSI standard is defined  by Request For Comments (RFC) 3720: https://tools.ietf.org/html/rfc3720 An introduction to the workings of iSCSI protocol can be found in  iSCSI Implementation and  Best Practices on IBM Storwize Storage Systems , SG24-8327. Chapter 3. Planning  69 3.7.1 iSCSI protocol GLYPH<SM590000> If the optional 10 Gbps Ethernet feature is installed, you can use them for iSCSI traffic. GLYPH<SM590000> All node types that can run SAN Volume Controller V6.1 or later can use the iSCSI feature. GLYPH<SM590000> Generally, enable jumbo frames in your iSCSI storage network. GLYPH<SM590000> iSCSI IP addresses can be configured for one or more nodes. GLYPH<SM590000> iSCSI Simple Name Server (iSNS) addresses can be configured in the SAN Volume  Controller. GLYPH<SM590000> Decide whether you implement authentication for the host to SAN Volume Controller iSCSI  communication. The SAN Volume Controller supports the Challenge Handshake  Authentication Protocol (CHAP) authentication methods for iSCSI. Figure 3-17 SAN Volume Controller iSCSI overview | SVC: ITSO-CL1 IOGRP _0 SVC Node (N1) Port1 Port2 SVC Node (N2) Port1 Port2 P0 P1 LAN/iSCSI LAN iSCSI Target Node: iqn.1986-03.com.ibm:2145.itso-cl1.N1 Network Portal (1): IPv4 address assigned to Port1 Network Portal (2): IPv6 address assigned to Port1 Network Portal (3): IPv4 address assigned to Port2 Network Portal (4): IPv4 address assigned to Port2 iSCSI Target Node: iqn.1986-03.com.ibm:2145.itso-cl1.N2 Network Portal (1): IPv4 address assigned to Port1 Network Portal (2): IPv6 address assigned to Port1 Network Portal (3): IPv4 address assigned to Port2 Network Portal (4): IPv4 address assigned to Port2 iSCSI Network Entity, i.e SVC cluster  iSCSI Initiator  MPIO  iSCSI Initiator Node: iqn.1991-05.com.microsoft:itsoW2008