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So recently I took a field trip with my Comp TIA Network+ class to a datacenter here, just North of Indianapolis.
What a cool place...
I'm sorry I don't have any pictures, but I did not think to bring my camera (actually I did, but I was worried they wouldn't appreciate me snapping pictures).
First off, to get it, we had to enter through 2 doors into a room with an ID and back-of-the-hand scanner. Since we had neither, they had to open the doors from inside for us. They were locked shut by 1300LB+ electro-magnets that are designed to be stronger than the hinges themselves.
Once in, we could see the monitoring and security room to the right. Two or 3 people were in there watching a huge array of 17\" SyncMaster screens with video feeds on them. Our 'tour guide' came out. He was a marketing guy I believe... one of the more senior people in the building. First off, we walked past a room with rows and rows of black cabnets (racks, like you always see in ads for data centers). This was all of Monster (.com). The next room was filled with the same racks, but beige. There was a tech setting up a new server in that room, so we continued on to the next (another one just like it).
Our guide opened the (magnetic) door with his electronic key and we entered. The noise was amazing. Probably about 65-70db of air movement. There were two people in the back with laptops. He mentioned that the floor was raised 18\" for cabling and air movement.
We exited out the back (the doors opened via motion detectors). He showed us two of the 4 30 ton A/C units. The room can be run on 3, but the 4th is backup (as is key in a data center). One of them was being repaired. In case of emergency, a mobile A/C unit was there because with only 2 A/C units, the servers can over-power them with heat.
He then showed us the Power Distrobution Units. Each room had power coming from each side of Indiana coming in, and being sent to the rooms. Depending on what you request, the servers are hooked to one of the power lines or both of them for more redundancy.
Next we went out back... to see the power conditioners and backup system...