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An administrator is configuring Storage DRS in their environment. The Datastore cluster is composed of 4 VMFS3 volumes and 9 VMFS5 volumes.
Storage DRS has been enabled, but is showing as disabled on several virtual machine disks in the datastore cluster.
Which two conditions would cause this error to occur? (Choose two.)
A. The virtual machine is stored on a VMFS 3 volume.
B. One or more virtual machines have Persistent disks.
C. The virtual machine is stored on a NFS datastore.
D. The virtual machine is stored on a datastore with a 2mb block size.
Correct Answer: AB
Explanation/Reference:
I couldn’t verify these answers so I’m going with the standard answers.
http://blogs.vmware.com/vsphere/2011/07/vsphere-50-storage-features-part-5-storage-drs-initial-placement.html states that you can place VMFS 3 and 5 in the same datastore cluster, but it is not recommended.So A might be correct. The key word is might. Nowhere does vSphere state that mixed VMFS versions will cause storage DRS issues.
B is not correct. Persistent mode disks are actually a requirement for Storage vMotion. So the fact the VMs have persistent disks is great.
http://pubs.vmware.com/vsphere-50/index.jsp?topic=%2Fcom.vmware.vsphere.vcenterhost.doc_50%2FGUID-A16BA123-403C-4D13-A581-DC4062E11165.html&resultof=%22%73%74%6f%72%61%67%65%22%20%22%73%74%6f%72%61%67%22%20%22%76%6d%6f%74%69%6f%6e%22%20DC4062E11165.html&resultof=%22%73%74%6f%72%61%67%65%22%20%22%73%74%6f%72%61%67%22%20%22%76%6d%6f%74%69%6f%6e%22%20
The above blog also states that VMFS and NFS datastores cannot be mixed in the same datastore cluster. Which is confirmed here:
http://pubs.vmware.com/vsphere-51/index.jsp?topic=%2Fcom.vmware.vsphere.resmgmt.doc%2FGUID-34A10B42-C79E-491C-A5AA-99E3B5FA2278.html
In other words, you cannot create a datastore cluster with mixed VMFS and NFS datastores. vSphere wont let you. Since the question specifically states that there are only VMFS datastores in the cluster, it would be impossible for a VM to be on a NFS datastore so C cannot be correct.
The fact that the datastore has a 2mb block size is meaningless. neither storage vMotion, storage DRS, or datastore clustering have any block size requirements.
You might be able to infer that this is VMFS 3, but then again, if the datastore had been upgraded to 5, the old block size if retained. So the datastore could be either VMFS 3 or 5. D is not correct.