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.
I think is B and D.
A cannot be a good answer since if Server 1 and Server 2 is failed, than the cluster quorum won’t have the majority (2 votes only from server 3 and 4), so the cluster will stop.
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This is a tough one because it depends where the disk is located. Why D and why not C? Agree about A though
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D because the storage is replicated between two storage arrays that host the same volume used to make the CSV. If one site goes dark, the DR site storage becomes the active host of the CSV.
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It’s b and d. Node majority is for odd number of noded
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c y d
Node & File Share Majority
This quorum configuration is usually used in multi-site clusters. This configuration is used when there is an even number of nodes in the cluster, so it can be used interchangeably with the Node and Disk Majority quorum mode. In this configuration every node gets 1 vote, and additionally 1 remote file share gets 1 vote.
http://blogs.msdn.com/b/clustering/archive/2011/05/27/10169261.aspx
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MS doesn’t recommend disk only (b). C and D do the same thing.
https://technet.microsoft.com/en-us/library/cc731739.aspx
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According to Microsoft, answer is C (preferred) and D:
https://technet.microsoft.com/pt-br/library/dd197575(v=ws.10).aspx
“Any cluster with an even number of nodes should use a quorum configuration that includes a witness (disk witness or file-share witness) as a tie-breaker.”
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I have been working with MS Cluster for 5+ years and considering MS recommendations I’d choose C and D.
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I go with C & D. Node majority is never used with an even number of nodes, and No Majority (disk witness only) it’s not a good selection.
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I’ll go with c and D as well
The Node & Disk Majority
This quorum configuration is most commonly used since it works well with 2-node and 4-node clusters which are the most common deployments. This configuration is used when there is an even number of nodes in the cluster. In this configuration, every node gets 1 vote, and additionally 1 disk gets 1 vote, so there is generally an odd number of total votes.
The Node & File Share Majority
This quorum configuration is usually used in multi-site clusters. This configuration is used when there is an even number of nodes in the cluster, so it can be used interchangeably with the Node and Disk Majority quorum mode. In this configuration every node gets 1 vote, and additionally 1 remote file share gets 1 vote.
https://blogs.msdn.microsoft.com/clustering/2011/05/27/understanding-quorum-in-a-failover-cluster
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b && d
cant be A because if one site is offline cluster will be offline
cant be c because we have no file share here
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why dont anybody talk about dynamic quorum? it makes A correct,no?
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https://technet.microsoft.com/en-us/library/cc731739(v=ws.11).aspx
Based on the above link:
A – recommended for clusters with an odd number of nodes. We have an even number in our current config.
D – Node and disk majority – recommended for clusters with an even number of nodes. Having this configured, we can sustain up to 2 consecutive failures and still maintain quorum.
Node and File Share Majority (for clusters with special configurations)
Works in a similar way to Node and Disk Majority, but instead of a disk witness, this cluster uses a file share witness.
Disk only: Not recommended.
So, imo, the answer is C&D. We don’t want to use A because it can only sustain 1 failure, not B because Microsoft does not recommend it. If the quorum disk fails you lose the whole cluster.
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https://technet.microsoft.com/en-us/library/cc731739(v=ws.11).aspx
C & D
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Here is a good article that actually uses the same configuration as this test question.. quite informative.. C & D definitely the correct answers:
https://technet.microsoft.com/en-us/library/dd197519.aspx
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