You have a Windows Server 2012 R2 failover cluster that contains four nodes.
Each node has four network adapters.
The network adapters on each node are configured as shown in the following table.
NIC4 supports Remote Direct Memory Access (RDMA) and Receive Side Scaling (RSS).
The cluster networks are configured as shown in the following table.
You need to ensure that ClusterNetwork4 is used for Cluster Shared Volume (CSV) redirected traffic.
What should you do?
A.
Set the metric of ClusterNetwork4 to 90,000 and disable SMB Multichannel.
B.
On each server, replace NIC4 with a 1-Gbps network adapter.
C.
Set the metric of ClusterNetwork4 to 30,000 and disable SMB Multichannel.
D.
On each server, enable RDMA on NIC4.
Explanation:
Redirected traffic will be sent to the NIC with the LOWEST Metric, but in server 2012 CSVs use SMB Multichannel (which enables traffic to be redirected
using TWO NICs) so we also need to disable SMB Multichannel to prevent redirected traffic from being sent elsewhere on one of the other NICs.
C is correct.
By disabling SMB multichannel, the NIC with the lowest metric will be used for cluster traffic.
If any answer states ENABLE SMB MULTICHANNEL, that will be the correct answer, regardless of the metric as the cluster traffic will use the fastest NIC.
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No, did you mean “Disable SMB Multichannel” or “Enable SMB Multichannel” as one of the answers? I am a little confused by your explanation.
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SMB Multichannel is a new feature introduced with Windows Server 2012 together with SMB 3.0.
In Windows Server 2008 R2, there is no SMB Multichannel. CSV redirected traffic will use the network with the lowest metric.
In this question context (Windows Server 2012 R2), SMB Multichannel must be disabled so that CSV redirected traffic would use NIC4 in case that its metric is set to 30000.
Thank you, no!
See section 3.1. Single RSS-capable NIC in the blog below:
https://blogs.technet.microsoft.com/josebda/2012/06/28/the-basics-of-smb-multichannel-a-feature-of-windows-server-2012-and-smb-3-0/
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