VMWare - datastore was removed but is still "mounted".

I'm trying to reverse-engineer (so to speak) a configuration with a datastore in my environment.  

There is a datastore, named nas01.
nas01 also happens to be a Virtual Windows Server2003 R2 windows server, which appears to be running the "File Server" role.
The shared folder on the File Server is what the datastore in vSphere is mapping to.

There is a .iso on that datastore/shared folder I need to mount for deploying a new VM with the OS on the ISO, but when I go to choose an ISO from the Datastore on the VM settings, I cannot see the datastore "nas01" listed.

I checked the datastore's past "tasks" tab, and it does appear there was a "Remove datastore" successful task by someone else.
However, I can still see the datastore represented in Inventory > Datastores and Datastore Clusters" view. if I right-click it from there, it has the option to "unmount".

Can someone explain if it's still "mounted", and why I can browse it, but I cannot see it in the list of datastores on the VM settings when I go to pick an ISO?
garryshapeAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
What can happen, is the "phantom" datastore remains in the inventory database, because there is a reference to it, already by a VM.

If you remove these references, from the VM, it will disappear from the inventory.

The best way to check, is to check at the console. (e.g. physical console) or remotely by SSH.
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garryshapeAuthor Commented:
Well this datastore appears to still be browseable.
It's an NFS datastore so file path to a server and folder being shared from a virtual Windows server.
The datastore is connected to other hosts.

As for the host it's not working on, it's Datastore column shows "Unmounted" but with a state of "Connected, and Status of "Normal". But the whole row is  grey in italic.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
How very odd?

Are there any VMs in use on it ?

Do you know, how it was unmounted ?
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garryshapeAuthor Commented:
No idea but if I get rid of it, will it delete the actual NFS share?
I want to move the virtual disk that is the datastore to another Windows server.

What's the best way to remove it and then add it as a datastore to all hosts?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
If you remove from ESXi, it cannot delete the share on the Windows server, only the Windows OS configuration can remove the share, and then the data would not be removed.

So it's safe to remove, and present to another host.

Right Click the datastore and select Unmount.
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