Which of the following features can be used in combination with Network Attached
Storage (Choose Three)?
A.
VMware HA
B.
Virtual Machine Snapshots
C.
Raw Device Mapping
D.
Storage VMotion
E.
MSCS Clustering
Explanation:
VMware Infrastructure Automating High Availability (HA) Services with VMware HA,
page 15.
There are a few basic requirements that your virtual infrastructure system and hosts need
to meet so that VMware cluster and HA features operate properly. First, for clusters
enabled for VMware HA, all virtual machines and their configuration files must reside on
shared storage (Fibre Channel SAN, iSCSI SAN, or SAN iSCI NAS), because you need
to be able to power on the virtual machine on any host in the cluster. [A above]
Introduction to VMware vSphere ESX 4.0 ESXi 4.0 vCenter Server 4, page 19 and 20.
Each datastore is a physical VMFS volume on a storage device. NAS datastores are an
NFS volume with VMFS characteristics. VMFS also features failure consistency and
recovery mechanisms, such as distributed journaling, a failure consistent virtual machine
I/O path, and machine state snapshots. These mechanisms can aid quick identification of
the cause and recovery from virtual machine, physical host, and storage subsystem
failures [B above]
vSphere introduces several new capabilities to Storage VMotion. When Storage VMotion
was introduced in VI3 release 3.5, it had a few limitations which vSphere 4 addresses.
Storage VMotion is now fully integrated into vCenter and offers full support for
migration across datastores of several protocol choices. Hence the enhanced Storage
VMotion capabilities fall squarely in the realm of how vSphere provides an increased set
of choices. First the ability to move a VM home from one datastore to another while
changing the storage protocol in the process. The source datastore might be FC, iSCSI, or
NFS, and the target datastore any of those three. [D above]