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An administrator is deploying vSphere using a NAS device as the shared storage system. The administrator has already created a VMkernel port, enabled the NFS client, and configured a mount point accessible to the hosts.
Which additional configuration is required before the datastore can be used to create virtual machines?
A. The ESXi hosts must have root access to the datastore.
B. The NAS must support NFS version 4.
C. Port binding must be configured on the VMkernel port.
D. The MTU on the VMkernel port must be set to 9000.
Correct Answer: A
Explanation/Reference:
Explanation:
NFS Datastore Provisioning Steps:
Before a vSphere host can utilize NFS storage, the following configuration steps must be taken:
Create a new VMkernel port group for IP storage on an already existing virtual switch (vSwitch) or on a new vSwitch when it is configured. The vSwitch can be a vSphere Standard Switch (VSS) or a vSphere Distributed Switch (VDS).
Ensure that the NFS client on the vSphere host(s) is enabled.
Ensure that the NFS storage is configured to export a mount point accessible to the vSphere hosts on a trusted network.
You must also ensure that the vSphere host has root access to the datastore. This is typically done on NFS servers using the no_root_squash option in the /etc/exports file. Di!erent storage vendors have di!erent methods of enabling this functionality. If you do not grant root access, you might still be able to mount the NFS datastore on the vSphere host. However, you will not be able to create any virtual machines on the datastore. It will fail with an “unable to access file” error message.
Incorrect Answers:
B: VMware currently supports NFS version 3 over TCP only, not version 4. Therefore, this answer is incorrect.
C: Port binding is not required. Port binding is used for multipathing with iSCSI; it is not used for a NAS datastore. Therefore, this answer is incorrect.
D: An MTU size of 9,000 is a ‘jumbo frame’. While this can be used to improve performance providing all hardware devices support jumbo frames, it is not a requirement. Therefore, this answer is incorrect.
References:
http://www.vmware.com/files/pdf/techpaper/VMware-NFS-Best-Practices-WP-EN-New.pdf Page: 5-6