We have a Dell PowerEdge T310 running ESXi v4.0 and two production VM's (one Windows Server 2003 and one Ubuntu Linux). All of the storage for the server is local in 2 1TB SATA drives. It's been running flawlessly for approximately 200 days (since installed) but, beginning yesterday, is starting to randomly go offline. In the event log for the server, I see a series of messages "Lost access to volume <long number> (datastore1) due to connectivity issues. Recovery attempt is in progress and outcome will be reported shortly.". This error is showing up at random intervals every few minutes on the server all of a sudden.