Reposted from 8 years ago with moderator permission.
While in college, pursuing a degree in Information Systems, I got a job at now defunct Western Pacific airlines. It was basically a paid internship to do all sorts of computer related stuff. They were a small airline based in Colorado Springs, CO, and then later in Denver. They attempted to take over Frontier airlines and went bankrupt in 1998.
One day before I left work, my boss gives me several long Ethernet cables and tells me "Go patch in the new modems into the computer network." He liked to test me in ways like this from time to time. So I head down to the data room.
Now, I think it is important that you know that I had only been in a real data room twice before, and I had never worked in one. The boss knew this, and wanted to see if I could figure it out on my own or not. For those that don't know, data rooms have raised floors so you can run cables under the floor tiles, lots and lots of racks of computer equipment, tons of AC to keep it all cool, etc.
Anyway, I walk in, find the modem bank, find several modems that have no cables attached. I look at the ones that are wired in, follow the cables, figure out what switch they are plugged into, and wire up the new modems just like those. Power them up and see them connect to the switch on the local network. Then I replace the floor tiles I pulled up and head home for the day.
The next day I come in to work after class is out and my badge doesn't work. The guard tells me to wait. A minute later my boss and two security guards show up and escort me to the CEO's office. No one will talk to me and I'm freaking out. Inside the office, besides the CEO, are the CIO, CFO, my boss and the two bosses above him. They start questioning me.
What did I do yesterday at the end of the day? Did I get the modems working? Did I remove floor tiles? Did I notice anything out of the ordinary? Long story short, I had somehow kicked loose the power cable for the main pyramid server that ran the entire airline. They had no redundancy built into the network for that server. So for 45 minutes, WestPac could do nothing. They couldn't sell tickets, make reservations, board planes, take off, etc. Nothing. I inconvenienced thousands of people. I was told I cost the airline somewhere around $200,000. I don't know if that is accurate or not. Eventually someone noticed that the server had no power and plugged it back in. The airline was back up and running a few minutes later.
I didn't lose my job over that. They all had a good laugh, and admonished me to be more careful in the future. I suggested that they find a way to lock the cable down, but they rejected that idea. Maybe that kind of thinking is what led them to bankruptcy. I wasn't there at the end.
TL;DR: Disconnected a server by accident, the entire company went offline for 45 minutes.
whatproblems t1_iwzghsf wrote
no backup and the entire company relies on a single power cord to work…. all you did was expose the single point of failure that should have been fixed