Several months ago I was asked how to change all the vSAN VMkernel port IP Addresses in a vSphere cluster and today I was asked again, so here it is.
Non-Disruptively
Assuming each host has 2 VMkernel ports (a & b) enabled for vSAN traffic.
- Disable vSAN traffic on each of the b networking interfaces on each host
- Change the IP addresses on each of the b networking interfaces on each host
- Move the physical network cable if moving to new switch ports
- Re-enable vSAN traffic on each of the b networking interfaces on each host
- Verify communication between all the b networking interfaces using vmkping test.
- Testing VMkernel network connectivity with the vmkping command (1003728) https://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1003728
- Repeat for all the a networking interfaces
Disruptively (downtime is OK and/or the hosts are being moved)
- Follow the vSAN enabled vSphere cluster shutdown process:
- VSAN Part 11 – Shutting down the VSAN cluster http://cormachogan.com/2013/12/10/vsan-part-11-shutting-down-the-vsan-cluster/
- Or, if vCenter is running on the cluster, follow:
- Shutting down and powering on a VSAN 6.x Cluster when vCenter Server is running on top of VSAN (2142676) https://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2142676
- Move the hosts or the physical network cables if necessary.
- Power the hosts back on.
- Change the IPs of the VSAN VMKernel ports.
- Verify communication between all the networking interfaces using vmkping test.
- Testing VMkernel network connectivity with the vmkping command (1003728) https://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1003728
- Power on VM’s
Live Virtually 
In my lab test environment – a 3 node vSAN cluster, vSAN kernel port runs on VDS. I tried below steps and vSAN vmkernel port IP address was successfully changed, non-disruptively. Do you see any potential risk with these steps? Thanks.
1. Turn off vSphere HA.
2. Use the Add and Manage Hosts wizard in vSphere Distributed Switch to change host settings simultaneously.
3. Select the hosts which will be changed to use different subnets in vSAN vmkernel.
4. Select “Manage VMkernel adapters”
5. Change each vSAN VMkernel IP address for each ESXi host.
6. Finish the wizard
The IP of vSAN VMkernel is changed.
7. Turn on vSphere HA.
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