Hello,

I've got a small question about changing MTU on living 10 nodes vSan cluster.

I've network side prepared (changed) already MTU for vMotion. I've added an interface to separate vSan witness traffic (since it is on different settings and kept TMU1500 fro vsan witness traffic).

Now I need to change vmkernel for vSan from 1500 to 9000 MTU. I have some small doubts - for example if I will in the middle f that change and let's say I will have 5 hosts already with MTU9000 and another half still on MTU1500 - is it asking for trouble? Or vSan is somehow intelligent and it will be not sending frames with 9000 until all nodes in the cluster will have a jumbo frame set on vmkernel?

I can't migrate out VMs from vSan cluster.