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British Airways IT Outage Caused By Contractor Who Accidentally Switched off Power (independent.ie)
An anonymous reader shares a report: A contractor doing maintenance work at a British Airways data centre inadvertently switched off the power supply, knocking out the airline's computer systems and leaving 75,000 people stranded last weekend, according to reports. A BA source told The Times the power supply unit that sparked the IT failure was working perfectly but was accidentally shut down by a worker.
Not entirely true...
So it depends on what kind of UPS you're employing. If it's the really big ones, you know, the ones the size of generators, then you don't plug stuff directly into them. They tend to be centralized and distribute power to PDU's that are in the racks themselves. The servers plug into the PDU's in the racks, and those PDU's have on/off switches. My fat ass has bumped the power switch on PDU's more than once trying to squeeze into tight spaces between racks. UPS's aren't employed to protect against human error, they're designed to protect against loss of main power.
If you're data center is small enough, you can get away with UPS's mounted in the rack and plug your servers directly into them, but when you're talking about scale, that's just not feasible or cost effective.
Somehow I doubt British Airways data center is of the 'couple cabinents in a colo variety' and they've probably got the big UPS setup
Most likely the fault lies with whomever architected the data center. I'll bet either there's very little room between the racks, or the PDU's are mounted in a way they can be accidentally bumped (probably either mid rack or at the bottom). I personally have taken to mounting PDU's at the top of the rack on the backside just to minimize any potential human contact with them.