Heavy backend workload will issued Hosts small ping test (connectivity check) and Hosts large ping test (MTU check) alarm sometimes

Products

• VMware vSAN 8.x

Issue/Introduction

The vSAN got Hosts small ping test (connectivity check) and Hosts large ping test (MTU check) alarm sometimes for vSAN node , ping time exceed 5 seconds

YYY-MM-DDT19:03:11.250Z In(14) vsand[2103112]: [opID=02ac34d5-cf49 VsanHealthSystemImpl::RunPingTest] Ping latency result for peer 10.xx.xx.25: [2110, 5656, 8020, 8159, 3093, 5056]
........
YYY-MM-DDT19:33:11.331Z In(14) vsand[2103116]: [opID=02ac4bfb-d9ab VsanHealthSystemImpl::RunPingTest] Ping latency result for peer 10.xx.xx.21: [4043, 7773, 11220, 9912, 11529, 2702]

Environment

vSAN 8

Cause

Some VMs running in the vSAN node issued heavy IO load , then vSAN network uplink has heavy throughputs ,  that issued ping time exceed 5 seconds .

Resolution

Ignored it safety , or adjust workload of applications in virtual machine .