You are an Enterprise administrator for contoso.com. The corporate network of the company consists of servers that run Windows Server 2008 and client computers run Windows Vista.
You have been asked to design a storage strategy so that a distributed database application can be deploy on the network that runs on multiple servers. While designing the storage strategy, you need to ensure that you use existing network infrastructure and standard Windows management tools.
You also need to ensure that the storage space is allocated to servers as and when required and that the data is available if a single disk fails. Which of the following options would you choose to accomplish the desired goal? (Select two. Each correct answer will present a part of the solution.)

A.
A Fibre Channel (FC) disk storage subsystem that supports the Virtual Disk Service (VDS).

B.
A Fibre Channel (FC) disk storage subsystem that supports Microsoft Multipath I/O.

C.
An iSCSI disk storage subsystem that supports Microsoft Multipath I/O.

D.
An iSCSI disk storage subsystem that supports Virtual Disk Service (VDS).

E.
Configure the storage subsystem as a RAID 5 array.

F.
Configure the storage subsystem as a RAID 0 array.

Explanation:

To design a storage strategy so that a distributed database application can be deploy on the network that runs on multiple servers with given requirements, you need to deploy an iSCSI disk storage subsystem that supports Virtual Disk Service (VDS) and configure the storage subsystem as a RAID 5 array
Microsoft iSCSI Software Target option enables you to implement an iSCSI SAN with storage provisioning and management capabilities. Managed via the Microsoft Management Console, administrator’s can create and manage iSCSI targets and iSCSI virtual disks, as well as schedule, export, and locally mount snapshots for use in backup and recovery operations.
An iSCSI disk storage subsystem supports Virtual Disk Service (VDS) and Microsoft Multipath I/O. Virtual Disk Service (VDS) is a Windows service for managing volumes. Administrators now have a single interface that works with different vendors, if that vendor supplies a VDS hardware provider for their networked storage device. This same interface also works with directly attached storage, providing a unified view of all disks and volumes, regardless of being connected via SCSI, Fiber Channel, iSCSI or PCI RAID. VDS exposes the complex functionality provided by these storage hardware vendors and scales up to enterprise configurations.
Multipath I/O cannot be used because it only provides ability to use more than one physical path to access a storage device, providing improved system reliability and availability via fault tolerance and/or load balancing of the I/O traffic.
RAID 5 is the most powerful form of RAID that can be found in a desktop computer system. It provides increased storage array performance and Full data redundancy. RAID 0 cannot be used because it is the lowest designated level of RAID. It is actually not a valid type of RAID. It was given the designation of level 0 because it fails to provide any level of redundancy for the data stored in the array. Thus, if one of the drives fails, all the data is damaged.
http://blogs.technet.com/josebda/archive/2007/10/25/the-basics-of-the-virtual-disk-services-vds.aspx