A power interruption took down the VIC datacentre this morning. Unfortunately I didn't spot it before I left for work, so was unable to restart the systems until lunch. Sorry for the downtime. I think we've used up about half of this years downtime for the site so far since moving (target is 99.5% uptime)
This was caused by an uninterruptible power supply that has a minor fault : It is not producing a high enough voltage on the output (210 instead of 240 Volts) - as a result a short brownout can sometimes cause the server to stall and panic-stop.
It's a known problem and the problem UPS is intended to be replaced in the near future.