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.
Explanation:
A is correct
Before unmounting a LUN, ensure that datastore is not managed by Storage DRS.
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2004605
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D is the only one that will *prevent* you unmounting a volume. The others are all recommendations (best practice) but from testing you can unmount a datastore being managed by SDRS if there are no VMs on it. (B and C both incorrect).
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That same article has this at the bottom of the checklist:
Note: When using the vSphere Web Client with vSphere 5.1 and 5.5, only these checks are performed during the datastore unmount operation:
Host should not have any virtual machines residing on this datastore
Host should not use the datastore for HA heartbeats
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how D is correct ?
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From testing it’s the only one that prevents you from unmounting the datastore because the unmount option is greyed out. All the others let you do it.
I’ll agree on the face of it A is correct, but by the actual wording and testing I’ve found D to be correct.
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Agree. Corrcet answer are “D”.
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i did nt test it so cant say much about it..anyway thnx
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Practically, if you delete the LUN from storage first, while the datastore is still active in vsphere , then i believe Unmount option will get greyed out.
So answer is D
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Answer is A; just tried it in my lab. When you go to unmount, it shows you the validation check for the following:
-No virtual machines resides on the datstore
-The datastore is not part of a Datastore Cluster
-The datastore is not managed by storage DRS.
-Storage I/O control is disabled for this datastore.
-The datastore is not used for vSphere HA heartbeat.
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Ditto that
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The answer is A
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D – tested
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