I am running esxi 4.0.0, so apparently, I can't install plug ins to use the "maps" feature and see if anything is still pointing to a stuck datastore that won't delete.
The raid drives for the datastore, internal to the host, first lost one drive, then another, so the raid drive is degraded and the data has been lost. I am not trying to recover that data. All VM's have been recreated on an external NAS drive, using iscsi LUN, and aside from occasionally having that datastore disappear and then reappear after a reboot all is going well.
I have edited the settings of each VM I have, to make sure that none of the CD drives are pointing to an ISO on the stuck datastore. They have all been moved to ISO's of the iscsi datastore.
When I try to browse this datastore, there is one folder, but then vsphere disconnects as it tries to browse to the files. I suspect because the raid group is degraded or dead.
When I try to delete this datastore, I get the "resource vim.datastore is in use".
Since I am on 4.0.0 and the free version, i don't seem to have the CLI on the vsphere client.
I am not familiar with the CLI commands for esxi and only use the GUI, so need some help here.