For my new twin server with MB X9DRFR, during the install, "on select a disk to install or upgrade", I see two types of disks Local with 186.31 GB and Remote with 2.73 TB. I installed the ESXi on 186.31 GB disk under "Local". Once installation is complete and I reboot the server, my server does not boot from this local disk. When I went to Bios, I don't see anyway to select the local disk in "Boot device order" where I have installed the ESXi.
In the BIOS setup under BOOT section, please go to Hard Disk Drive BBS and select the “local” drive where EXSi installed so the boot Device will boot from it.