Your network contains a single Active Directory domain. The domain contains a server named
Server1 that runs Windows Server 2008 R2. Server1 has an iSCSI host bus adapter that connects to
an iSCSI target. You install an additional iSCSI host bus adapter on Server1. You need to ensure that
Server1 can access the iSCSI target if a host bus adapter fails. What should you do first?
A.
At the command prompt, run mpclaim.exe -l m 6.
B.
Install the Multipath I/O feature.
C.
Bridge the iSCSI host bus adapters.
D.
Install the Internet Storage Name Server (iSNS) feature.
Explanation:
About MPIO
Microsoft Multipath I/O (MPIO) is a Microsoft-provided framework that allows storage providers to
develop multipath solutions that contain the hardware-specific information needed to optimize
connectivity with their storage arrays. These modules are called device- specific modules (DSMs).
The concepts around DSMs are discussed later in this document. MPIO is protocol-independent and
can be used with Fibre Channel, Internet SCSI (iSCSI), and Serial Attached SCSI (SAS) interfaces in
Windows ServerR 2008 and Windows Server 2008 R2. Multipath solutions in Windows Server 2008
R2 When running on Windows Server 2008 R2, an MPIO solution can be deployed in the following
ways: By using a DSM provided by a storage array manufacturer for Windows Server 2008 R2 in a
Fibre Channel,
iSCSI, or SAS shared storage configuration.
By using the Microsoft DSM, which is a generic DSM provided for Windows Server 2008 R2 in a Fibre
Channel, iSCSI, or SAS shared storage configuration.
High availability through MPIO MPIO allows WindowsR to manage and efficiently use up to 32 paths
between storage devices and the Windows host operating system. MPIO provides fault tolerant
connectivity to storage. By employing MPIO users are able to mitigate the risk of a system outage at
the hardware level.
MPIO provides the logical facility for routing I/O over redundant hardware paths connecting server
to storage.
These redundant hardware paths are made up of components such as cabling, host bus adapters
(HBAs), switches, storage controllers, and possibly even power. MPIO solutions logically manage
these redundant connections so that I/O requests can be rerouted if a component along one path
fails.
As more and more data is consolidated on storage area networks (SANs), the potential loss of access
to storage resources is unacceptable. To mitigate this risk, high availability solutions, such as MPIO,
have now become a requirement.
Source: http://technet.microsoft.com/en-us/library/ee619734(WS.10).aspx