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Which condition would prevent an administrator from unmounting a VMFS datastore?
A. The datastore is being managed by Storage DRS.
B. The datastore contains vCenter Server templates.
C. The datastore is mounted by multiple hosts.
D. The storage backing the datastore is detached.
Correct Answer: D
Explanation/Reference:
Explanation:
This question is difficult because it does not state how the VMFS datastore is unmounted. If you use the vSphere client to unmount a datastore, it performs a series of checks including checking to see if the datastore is being managed by Storage DRS. If it is, you cannot continue to dismount the datastore.
However, if you use the vSphere Web client to unmount the datastore, the Storage DRS check is not performed. The web client only performs the following checks:
Host should not have any virtual machines residing on this datastore
Host should not use the datastore for HA heartbeats
If those two checks are passed, you can unmount the datastore.
The only option that will prevent a datastore being unmounted is if the storage backing the datastore is detached. This can happen if the LUN has been deleted or is offline for some other reason. In this case, the datastore is still visible in the vSphere client (or web client) but the Unmount option will be greyed out.
Incorrect Answers:
A: It is not recommended to unmount a datastore that is managed by Storage DRS. However, you can unmount a datastore that is being managed by Storage DRS by using the vSphere web client. Therefore, this answer is incorrect.
B: A datastore containing vCenter Server templates can be unmounted. Therefore, this answer is incorrect.
C: A datastore that is mounted by multiple hosts can be unmounted. While unmounting, you select which hosts the datastore should be unmounted from. Therefore, this answer is incorrect.
References:
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2004605