To install OS from media in a remote location, perform these steps.
For CD/DVD-ROM, insert media into the built-in or external CD/DVD-ROM drive.
For CD/DVD-ROM ISO image, ensure that ISO image(s) are readily available on a network shared location.
For more details, see the Setup Requirements for web-based client connection in Selecting the Console Display Option.
For CD/DVD-ROM boot media, select CD-ROM.
For CD/DVD-ROM ISO image boot media, select CD-ROM Image.
For floppy device driver boot media, if applicable, select Floppy.
For floppy image device driver boot media, if applicable, select Floppy Image.
If you are using an automated ESXi software installation image, you will need to create and provide the automated OS install image.
For detailed instructions for automating the installation setup process, consult the ESXi 5 installation documentation available at: http://www.vmware.com/support/pubs/vsphere-esxi-vcenter-server-pubs.html