Statefull install not work

Hi expert

I use esxi 5.1a and installed auto deploy in vCenterServer.

First, I configured hostprofile to "enable statefull installs to a USB disk on the host",

and apply hostporifle.

Next, ESXi boot up using PXE boot nomaly.

Then I login ESXi host using SSH, I can`t find esxi vibs.

Could you tell me how to configure stalefull install ?

Thank you

Hironori