How to check if a datastore is inactive?

Hi,

I'm looking for a reliable method to figure out if a datastore is inactive or not (greyed out). Symptom: NAS gets shut down for a while, NFS datastore becomes (and remains) inactive.

I tried:

(Get-Datastore -Name "backup" -Datacenter (Get-Datacenter "TEST" -erroraction "Stop") -erroraction "Stop").accessible

returns TRUE

and

((Get-Datastore -Name "backup" -Datacenter (Get-Datacenter "TEST" -erroraction "Stop") -erroraction "Stop")|Get-View).overallstatus

returns "green"

Nice but useless since the datastore is inactive, not accessible and the status should be "grey".

Is there any other method to figure that out?

Thanks,

Peter