When you set up your host to boot from a SAN, your host's boot image is stored on one or more LUNs in the SAN storage system. When the host starts, it boots from the LUN on the SAN rather than from its local disk.

You can use boot from the SAN if you do not want to handle maintenance of local storage or have diskless hardware configurations, such as blade systems.

ESXi supports different methods of booting from the iSCSI SAN.

Boot from iSCSI SAN support

Independent Hardware iSCSI

Software iSCSI and Dependent Hardware iSCSI

Configure the iSCSI HBA to boot from the SAN. For information on configuring the HBA, see Configure Independent Hardware iSCSI Adapter for SAN Boot

Use the network adapter that supports the iBFT. For information, see iBFT iSCSI Boot Overview.