Installation Guide

Disable Receive Segment Coalescing (RSC) on a Virtual Switch
(Windows Server 2019)
About This Task
Windows Server 2019 Hyper-V has a new feature on a Virtual Switch called Receive Segment
Coalescing (RSC), which is enabled by default.
This feature results in Hyper-V server freeze when there is excessive trac.
Tip
The best practice is to disable the RSC feature on the virtual switches used for the appliance
data ports (PhysAdapter1 and PhysAdapter2).
Use the following commands for the Power Shell:
Procedure
1. Check the existing setting by using the command:.
Get-VMSwitch -name <vSwitch-Name> | Select-Object *RSC*
2. Disable RSC by using the command
Set-VMSwitch -name <vSwitch-Name> -EnableSoftwareRsc $false
Clone a Deployed Virtual Appliance
It is possible to clone a deployed virtual appliance. If the source virtual machine is o when you launch
the clone virtual machine, the clone virtual machine will use the original MAC address, which will result
in MAC address change on the original virtual machine. This will result in an unstable setup.
To avoid this issue, when you clone a virtual machine, ensure that the original virtual appliance and any
other clones derived from the original virtual appliance are running. This is to keep the MAC addresses
on all the appliances separate.
Warning
Assign MAC addresses to the cloned virtual appliances manually. If you run a cloned virtual
appliance before changing the MAC address, the license on the original virtual appliance will
become invalid.
Configure Virtual Switches for the Virtual Appliance
Disable Receive Segment Coalescing (RSC) on a Virtual
Switch (Windows Server 2019)
VE6120H Virtual Appliance Installation Guide for version 4.76.02 37