In BA’s case, the UPS in question delivers power through the mains, diesel and batteries.
On Saturday morning, shortly after 8.30am, power to Boadicea House through its UPS was shut down – the reasons for which are not yet known.
Under normal circumstances, power would have been returned to the servers in Boadicea House slowly, allowing the airline’s other Heathrow data centre, at Comet House, to take up some of the slack.
But, on Saturday morning, just minutes after the UPS went down, power was resumed in what one source described as “uncontrolled fashion.” “It should have been gradual,” the source went on.
This caused “catastrophic physical damage” to BA’s servers, which contain everything from customer and crew information to operational details and flight paths. No data is however understood to have been lost or compromised as a result of the incident.
BA’s technology team spent the weekend rebuilding the servers, allowing the airline to return to normal operations as of today.
Umm, they didn’t have a 100% mirror, entirely redundant back up, system on another site, on another power supply?