I'm not too familiar with this but as I understand it you you may have the disk encrypted with a key that is loaded from some other server at boot automatically

I'm not too familiar with this but as I understand it you you may have the disk encrypted with a key that is loaded from some other server at boot automatically. The key server may then require a manual un-seal to un-encrypt it's own key storage. If you steal the server and it loses power then the key is gone. Of course, there's ways around this like switching the server to a battery and possibly then literally freezing the RAM to dump it.