Your network consists of a single Active Directory domain. The network contains a file server that runs Windows Server 2008 R2. All servers use internal storage only. You plan to deploy a client/server application.
You need to deploy the application so that it is available if a single server fails. You must achieve this goal while minimizing costs.
What should you do?
A. Deploy RemoteApp.
B. Deploy a failover cluster that uses No Majority: Disk Only.
C. Deploy a failover cluster that uses Node and File Share Disk Majority.
D. Deploy Distributed File System (DFS) and configure replication.
Correct Answer: C
Explanation/Reference:
HIGH AVAILABILITY OF APPLICATION/SERVICE
A client/server application is an application that uses a central place (server) to store its data but is accessed from one or more client computers, e.g. SQL, Outlook/Microsoft Exchange, dynamic web-based applications.
Failover clustering provides high availability for client/server applications, DFS Namespace Server, DHCP Server, Distributed Transaction Coordinator (DTC), File Server, Internet Storage Name Service (iSNS) Server, Message Queuing, Print Server, Remote Desktop Connection Broker (formerly TS Session Broker), Virtual Machine and WINS Server.
Failover clustering is configured according to quorum. Quorum for a cluster is determined by the number of voting elements (active cluster members) for that cluster to start properly or continue running. Cluster configuration is stored in the nodes, disk witness and/or file share witness. There are 4 quorum configurations:
1. Node Majority (recommended for clusters with an odd number of nodes)
2. Node and Disk Majority (recommended for clusters with an even number of nodes)
3. Node and File Share Majority: An alternative to Node and Disk Majority by using a file share witness instead of a disk witness.
4. No Majority: Disk Only (not recommended): Can sustain failures of all nodes except one (if the disk is online). However, this configuration is not recommended because the disk might be a single point of failure.
(Comment: But how about providing high availability for the disk witness, e.g. RAID 1/5 with MPIO? Such a configuration maximizes the availability of the nodes!)
http://technet.microsoft.com/en-us/library/cc731960.aspx
http://technet.microsoft.com/en-us/library/cc731739.aspx
