Monitoring Your Racks for Cheap

When we were setting up our locking cabinets at the new data center for my job I was wondering how to actively monitor the security around our cabinets. Being that only myself and the data center staff have keys to the cabinets I wanted to be able to monitor when anyone entered them. I came up with a simple solution to be able to monitor the racks and keep track of changes. First I downloaded ZoneMinder, which is cam software that runs on Linux. It allows you to setup cheap consumer grade cams to monitor security. With such advanced features as motion detection. This made it ideal for my needs since I could go buy two cheap $30 web cams to use for front and back of cabinets. Then all I had to do was install ZoneMinder on our monitoring server and configure it for motion detection captures. Now the only step for me to do was put a sign-in sheet inside our cabinet with fields for techs name, date, time, and what was done in cabinet. Then require the data center staff to fill out the sheet every time they enter the rack. Another good idea is to do this before signing a contract with the data center you have chosen. Then you can stipulate that if they enter the rack without signing the sheet you get X amount off your bill that month for each infraction.