I just upgraded to VMware vCenter Server 4.x yesterday. Everything went fine. There appears to be a status column next to the datastores now on the summary tab for each ESX host now. Several of the datastores have the yellow triangle with an exclamation point or the red diamond with an exclamation point. I can't find in the documentation what this exactly means. I'm thinking that it means a space issue, but where are the values that correspond to this and is it configureable? Is this in the documentation anywhere?