I came in this morning to find that our Host server running ESX 4.1 was completly frozen. Some guests using CentOS were reporting the disks as read only. Other guests using Windows Server 2008 R2 were accessable but very very slow. I could not waite to see what they were reporting. Ping was working on all Guests and the Host. Consoled into the Host to find that its completly frozen. Only a reboot fixed it.
How can I find out what the root cause was?