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
I am confused. I guess this is because I have not found anything on Node majority with an even number of nodes. So with node majority, it requires at least half the nodes?
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So here is the problem I have with this question.
A. Everything I have found says the you need at least half of the nodes running rounding up, but they also are only odd node configurations. So a 5 node cluster needs at least 3 nodes running to achieve quorum. A 4 node cluster will need 3 nodes to achieve quorum as well. (thats what I read and am not sure about it).
B. No Majority: Disk Only will allow the cluster to function with only one node and the disks working. This will work.
C. Node and File Share Majority will work for this scenario only if there is a third site for the file share to go.
D. Node and Disk Majority is the same way with file share. If they disk witness is placed in a third site, then the cluster can continue running.
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So I have done this in a lab and only DISK ONLY will work. Node Majority will require 3 running cluster nodes to continue running. I failed two of the nodes and the cluster failed to continue running. File share and disk witness will only work if there is a third site in this situation, but there was no mention so that will not work. The only correct answer for this question is disk witness only. As long as that disk is not running on one of the servers that failed.
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I am changing my answer again. Final Answer now. Tested in lab. Shows how much attention must be paid when reading the question. The question states two nodes in the same office fail. Not the wan link failing. Because it is only the nodes failing, both sites will still be able to contact the disk witness and file share witness. Therefore correct answer is C and D. Disk only would work, but Microsoft does not recommend it. I tested in lab and Guarantee C and D will 100% work for this question.
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I agree with C and D for this reason:
‘When you configure Node and File Share Majority or Node and Disk
Majority as your Quorum configuration, the failover cluster can reach Quorum when only half
of the nodes remain online (as opposed to a clear majority), as long as they can also communicate
with the disk witness or file share witness.’
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I agree. C and D.
Crazy answer when I first saw it as node majority will not work if equal numbers of nodes. Unless some votes are removed.
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I will go for B & D.
Nodes go down but storage is still up so confirm with B & D will work. FSW will be used in practical world (I never seen B & D used for a geo cluster in any cases during my life), but since it doesn’t mention you can use a file server in the question…
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Correct Answers: B, C, & D
B is NOT recommended, making the best answers C & D.
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