Unexpected power cycle of barbar.bitfolk.com

Hi, At approximately 0442Z today, 2011-04-05, I was alerted that several VPSes on barbar.bitfolk.com were not responding. On investigation, the host itself was displaying kernel errors related to Xen, and was also unresponsive. At this point I decided to power cycle it. When it came back up several of its RAID devices would not mount. It looked like this was just because of the power cycle; a write had managed to hit one of the disks but not any of the others, and a mount could be forced. I didn't want to rush into anything though due to the possibility of data loss. After some further investigation, I was able to find a way to sync the arrays and mount cleanly, and boot progressed. As of approximately 0521Z VPSes have been starting up again on barbar and this has just completed. I am not seeing any problems at the moment, though there is high disk contention due to many VPSes trying to fsck at once and a background verify of RAID integrity taking place. barbar had previously been up for nearly 2 years so many VPSes on it require fsck. For now we'll be keeping a close eye on the server and later today will investigate further. Please accept my apologies for the disruption. Cheers, Andy -- http://bitfolk.com/ -- No-nonsense VPS hosting