Your company has a main office and a remote office. The remote office is used for disaster recovery. The network contains an Active Directory domain named
contoso.com. The domain contains member servers named Server1, Server2, Server3, and Server4. All servers run Windows Server 2012 R2. Server1 and
Server2 are located in the main office. Server3 and Server4 are located in the remote office.
All servers have the Failover Clustering feature installed. The servers are configured as nodes in a failover cluster named Cluster1. Storage is replicated between
the main office and the remote site. You need to ensure that Cluster1 is available if two nodes in the same office fail. What are two possible quorum configurations
that achieve the goal? (Each correct answer presents a complete solution. Choose two.)
A.
Node Majority
B.
No Majority: Disk Only
C.
Node and File Share Majority
D.
Node and Disk Majority
Explanation:
Depending on the quorum configuration option that you choose and your specific settings, the cluster will be configured in one of the following quorum modes:
* (A) Node majority (no witness) Only nodes have votes. No quorum witness is configured. The cluster quorum is the majority of voting nodes in the active cluster
membership.
* (B) No majority (disk witness only) No nodes have votes. Only a disk witness has a vote. The cluster quorum is determined by the state of the disk witness. The
cluster has quorum if one node is available and communicating with a specific disk in the cluster storage. Generally, this mode is not recommended, and it should
not be selected because it creates a single point of failure for the cluster.
* Node majority with witness (disk or file share)
Nodes have votes. In addition, a quorum witness has a vote. The cluster quorum is the majority of voting nodes in the active cluster membership plus a witness
vote. A quorum witness can be a designated disk witness or a designated file share witness.
Note:
* Quorum in Windows 2008 R2 referred to a consensus , that is, a majority of votes is required in order to reach quorum and maintain stability of the cluster. A new
option created in Windows Server 2012 R2 which was also back ported to Windows Server 2008 R2 SP1 was the ability to stop a node being able to participate in
the voting process.
* Dynamic quorum is the ability of the cluster to recalculate quorum on the fly and still maintain a working cluster. This is a huge improvement as we are now able to
continue to run a cluster even if the number of nodes remaining in the cluster is less than 50%. This was not possible before but the dynamic quorum concept now
allows us to do this. In fact we can reduce the cluster down to the last node (known as last man standing) and still maintain quorum. Reference: Configure and
Manage the Quorum in a Windows Server 2012 R2 Failover Cluster