For most companies, the computer room where the company servers containing the delicate data originating from daily transactions is the most important place in the office. So while the people here are trying to figure out ways to safeguard these servers, it would be likewise important to consider external security measures such as placing locks and monitoring the activities with the use of spy cams.
Why is this important? The right question should be geared on how well do you trust you IT personnel. Evaluate their personality and see the extent to which they may betray the company and place operations in jeopardy. This not of course to discredit them but in reality, a lot of people use their knowledge and access as leverage towards being able to command salaries and money-related deals that many of us know as blackmail.
Also, physical intrusion is always a possibility. No matter how secure your area would be, it can be breached at anytime if you do not address the right measure to make it harder for them to gain access to the computer room. In short, the harder it is to get in to you computer room, the better it is. This only means you have prepared on the physical aspect of securing your IT area which is a good approach the sake of safeguarding hardware and data.