Configure SAN Components and Storage System :
Before you set up your ESXi host to boot from a SAN LUN, configure SAN components and a storage system.
Because configuring the SAN components is vendor specificǰ refer to the product documentation for each item.
>> Connect network cable, referring to any cabling guide that applies to your setup. Check the switch wiring, if there is any.
>> Configure the storage array.
++ From the SAN storage array, make the ESXi host visible to the SAN. This process is often referred to as creating an object.
++ From the SAN storage array, set up the host to have the WWPNs of the host’s adapters as port names or node names.
++ Create LUNs.
++ Assign LUNs.
++ Record the IP addresses of the switches and storage arrays.
++ Record the WWPN for each SP.
Configure Storage Adapter to Boot from SAN :
When you set up your host to boot from SAN, you enable the boot adapter in the host BIOS. You then configure the boot adapter to initiate a primitive connection to the target boot LUN.
Determine the WWPN for the storage adapter.
Configure the storage adapter to boot from SAN. Because configuring boot adapters is vendor specificǰ refer to your vendor documentation.
Set Up Your System to Boot from Installation Media
>>When seĴing up your host to boot from SAN, you first boot the host from the VMware installation media. To achieve this, you need to change the system boot sequence in the BIOS setup. Because changing the boot sequence in the BIOS is vendor specificǰ refer to vendor documentation for instructions.
The following procedure explains how to change the boot sequence on an Dell host.
>> During your system power up, enter the system BIOS ConfigurationȦSetup Utility.
>> Select Startup Options and press Enter.
>> Select Startup Sequence Options and press Enter.
>> Change the First Startup Device to [CD-ROM].
You can now install ESXi
For further reference please follow : https://docs.vmware.com/en/VMware-vSphere/6.5/vsphere-esxi-vcenter-server-65-storage-guide.pdf