Enable Jumbo Frames in a vSAN Cluster

Products

• VMware vSAN

Issue/Introduction

Configuring vSAN VMkernel port to support Jumbo Frames.

Resolution

Note: These steps can cause a brief connection interruption. Therefore, a maintenance window should be scheduled which would allow all VMs to be powered off while the changes are being made. Once Jumbo Frame connectivity is confirmed between all hosts, VMs can be powered on again.

1. Change the MTU value to 9000 on the physical switch port the vSAN vmnic is connected to.
   Note: Some switches require a size larger than 9000 to handle packet overhead. Check with the network admin or Switch Documentation to be sure.
2. Configure the MTU value of vDS switch (if applicable) so that all port groups and ports use Jumbo Frames or vSS.
   
   Enable Jumbo Frames on vSphere
   
   vDS
   
   
   vSS
   
3. Change the VMkernel port to 9000.
   
4. When all hosts have been configured, test connectivity on all hosts between the vSAN VMkernel interfaces.
5. The example assumes vmk2 is the vSAN interface.
   
   # vmkping -I vmk2 -d -s 8972 IP_Address_of_OtherHost_vmk