Dell Integrated System for Microsoft Azure Stack HCI is configured in the fully converged or non-converged network topology with the following adapters:

• Mellanox ConnectX-4 Lx
• Mellanox ConnectX-5 LX
• Mellanox ConnectX-6 DX
• NVIDIA ConnectX-6 LX
• Intel E810 25GbE/100GbE (when RDMA protocol is RoCEV2)
• Intel E823

These adapters require DCB configuration on the ToR switches and Quality of Service (QoS) configuration in the host operating system. High-performance NVMe configurations using QLogic network interface controllers might also require these configurations.

Ensure that the QoS policies are configured to prioritize the SMB traffic related to the storage adapters. Ensure that the QoS configuration in the host operating system matches the QoS configuration that is performed in the network switch configuration.

The following tables provide an overview of QoS priorities and the required state for the set of priorities.

Perform the following steps to configure QoS in the host operating system.

# Variables for the scenario
$StorageAdapters = @('SLOT 1 PORT 1','SLOT 1 PORT 2')
​
#New QoS policy with a match condition set to 445 (TCP Port 445 is dedicated for SMB)
#Arguments 3 and 5 to the PriorityValue8021Action parameter indicate the IEEE 802.1p #values for SMB and cluster traffic.
New-NetQosPolicy -Name 'SMB' –NetDirectPortMatchCondition 445 –PriorityValue8021Action 3
New-NetQosPolicy 'Cluster' -Cluster -PriorityValue8021Action 5 
​
#Map the IEEE 802.1p priority enabled in the system to a traffic class
#Customer may change the bandwidth for the below traffic class based on their environments
New-NetQosTrafficClass -Name 'SMB' –Priority 3 –BandwidthPercentage 50 –Algorithm ETS
New-NetQosTrafficClass -Name 'Cluster' –Priority 5 –BandwidthPercentage 2 –Algorithm ETS
​
#Configure flow control for the priorities shown in the above table
Enable-NetQosFlowControl –Priority 3
Disable-NetQosFlowControl –Priority 0-2,4-7
​
#Enable QoS for the Mellanox network adapter ports.
foreach ($port in $StorageAdapters) {
    Enable-NetAdapterQos –InterfaceAlias $port
}
​
#Disable DCBX Willing mode
Set-NetQosDcbxSetting -Willing $false
​
#Enable IEEE Priority Tag on all network interfaces to ensure the vSwitch does not drop the VLAN tag information.
 $nics  = Get-VMNetworkAdapter -ManagementOS
 ForEach ($nic in $nics) {
    Set-VMNetworkAdapter -VMNetworkAdapter $nic -IeeePriorityTag ON
 }