We have 3 ESXi 4.0 servers , from last week ... two of them get rebooted at the same time. one time it happened @ 1:30 AM on Friday and next time was today @ 8:00 AM.
we had some cabling changes in serevr room last week , so I thought maybe it's a power issue , but ESX servers are connected to different outlets and other servers are connected to the same outlets...
How I can investigate this issue ? log files are very complicated and they are getting rolled over after ESX reboot . I extracted all zip files inside report bundles but didn't get anything for the time of reboot.