And run the entire server out of memory. 64GB of ram is cheap on servers now; you boot from a write-protected flash drive, and everything is done in memory. If you power the box down, anything stored in ram is lost.
I believe that in almost all cases, the LEO tasked with seizing equipment in an operation are going to be ill-equipped to execute this attack. Now, if its the CIA or NSA after you, you have other problems.