esxi vCenter 6.7, NICs for VM traffic go down suddenly.
We have three esxi server with this physical network configuration:
vmnic0 & vmnic1 – 1Gb copper interfaces for management and vMotion
• Configured via vSwitch0
• Management is isolated to vmnic0; can fail over to vmnic1
• vMotion is isolated to vmnic1; can fail over to vmnic0
vmnic2 & vmnic3 – 10Gb fiber interfaces for iSCSI storage and VM traffic; configured via DSwitch01
• VM traffic traverses both interfaces
• iSCSI traffic is load-balanced across both physical interfaces, via two vmkernel ports bound to each interface (noted below); this allows for two paths to each datastore
Starting two weeks ago on one of the esxi vmnic2 & vmnic3 when down but at the switch side the port is up. We lost contact will all server in this host, vMotion fails in these machines.
The only solution is shutdown the esxi server. When it is back NICs are up.
I open a case with VMWare, they do not find software issue, same with DELL no hardware problem.
I notice that at the time of the three events a VEEAM backup of the file server was running and the VEEAM server was in in the faulty esxi (one time in #1 and two times in #3).
Any idea how to start to troubleshoot this issue