Scenario: An administrator tries to start a virtual machine on a host that has an NFS storage repository. The virtual machine gives the error "This virtual machine needs storage that cannot be seen…

Mei-Ling H.May 20, 2026

The error "This virtual machine needs storage that cannot be seen from the server" means the host has lost its connection to the NFS SR, so the VM cannot locate its disk. The key word in the question is "correct this issue," which rules out Forget (removes the SR record entirely) and Detach (takes it offline on purpose), and Set as Default has nothing to do with connectivity. The correct answer is A, Repair. In XenCenter, right-clicking the NFS SR and choosing Repair re-establishes the broken connection between the host and the storage repository without destroying any data or configuration. That one action restores visibility to the SR so the VM can start normally.

Nina C.Jun 5, 2026

Okay so I got tripped up on B at first because "Forget" sounds like you're clearing out a broken connection, which kind of feels like a reset, but Forget actually just removes the SR record from the pool database without fixing anything, so the VM still can't see its storage and you've now made it harder to recover. The error is telling you the host lost its connection to the NFS SR, and the Repair action in XenCenter is specifically designed to re-probe and reconnect a storage repository that has become inaccessible, which is exactly the situation here. Detach would just make things worse by intentionally disconnecting it, and Set as default has nothing to do with connectivity at all. So the answer has to be A, Repair, because that is the one action that actually tries to restore the link between the host and the SR so the VM can see its storage again.

Dervla O.Jun 13, 2026

The NFS SR lost its connection, so why does Repair re-establish it rather than just remounting?

Grace U.Jun 2, 2026

That error message is telling you the host has lost its path to the storage, not that the storage is gone forever, so the fix needs to restore that connection rather than remove anything from the picture. Think about what each option actually does to the relationship between the host and the SR: two of those choices sever or hide that relationship, one just changes a preference, and only one attempts to reestablish what was lost. When an NFS SR goes into a broken state, XenCenter gives you a way to essentially knock on the door again and ask the host to reconnect to it, which lines up directly with what the error is describing. The answer here is the one that says, in effect, something is wrong, let me try to fix it rather than walk away from it. Here is my question for you: do you understand the difference between what happens to a VM's metadata when you use Forget on an SR versus when you use Repair? That distinction shows up in other scenarios on this exam, and getting it straight now will help you reason through similar questions without second-guessing yourself.

Isolde G.May 27, 2026

Forget clears the stale reference so XenCenter can rediscover the NFS SR cleanly.