Hosts are experiencing performance issues causing virtual machines to underperform, skyline health reports MTU errors.
Article ID: 393305
Updated On:
Products
Issue/Introduction
Ongoing error in Skyline Health > Network > vSAN: MTU check (ping with large packet size)
This article also applies to ping with small packet size
Received bandwidth is a fraction of expected bandwidth for one or more hosts, under vSAN cluster > Monitor > vSAN > Proactive Tests > Network Performance Test
# esxcli vsan health cluster list
Health Test Name Status
-------------------------------------------------- ----------
Overall health yellow (Network misconfiguration)
Network yellow
Hosts with connectivity issues green
vSAN cluster partition green
All hosts have a vSAN vmknic configured green
vSAN: Basic (unicast) connectivity check green
vSAN: MTU check (ping with large packet size) yellow
Environment
VMware vSAN 7.0
VMware vSAN 8.0
Cause
This Alert is triggered when > 30 percent packet loss while pinging with small/large packets.
The alert may trigger with mis-configured MTU settings in the vSAN network in the datacenter.
Malfunctioning hardware like SFP, physical switch port, cables can also result packet loss.
Resolution
Follow article vSAN Health Service - Network Health - Hosts small ping test (connectivity check) and Hosts large ping test (MTU check)
Replacing SFP adapter, resolved the issue.
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