Automatically mounting an external Firewire drive after reboot, without login
I just upgraded one of my servers from Snow Leopard to Mavericks and I ran into a similar problem. I knew that I had fixed it before and the method still seems to work in Mavericks.

In /Library/Preferences/SystemConfiguration/ you need to add the file autodiskmount.plist with the following content:

&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"&gt;
&lt;plist version="1.0"&gt;
&lt;dict&gt;
    &lt;key&gt;AutomountDisksWithoutUserLogin&lt;/key&gt;
    &lt;true/&gt;
&lt;/dict&gt;
&lt;/plist&gt;


It should go without saying, but you will need admin privileges to do this. I believe you will also need to reboot. Then, without logging in on your server, check if the other computers on your network can see the external drive.