iSCSI connectivity issues - troubleshooting help

[atakacs]

All the sudden (ie for the past day or so) we see connectivity issues for our iSCSI storage hosted on a trueNAS server



I don't see any issue on TrueNAS server (ie nothing in logs / etc).

Ping are "clean" both way (ie Esx to NAS and NAS to Esx)



Any suggestion as of how to diagnose this ?

ESX 6.7u3 vs TrueNAS-SCALE-22.12.3.3. No known config change as of late.

 

[Podilarius]

I have seen this before when inadvertently, an interface on another machine was assigned the same IP address.
If you have a linux machine try:

arping -c3 192.168.192.194

If you get different MAC address responding, then you might have duplicate IPs on the network.
If you have bonded interfaces, you will want to unbind them and setup multipath within ESXi. At least as a test.
After you have stopped your VMs and unmounted the storage, of course.

 

[atakacs]

Thanks - interesting suggestion !