[VSAN] remove witness interface

[sappomannoz]

Hello,

 

years ago I configured a vSAN stretched cluster, the witness was on a remote site so I used a dedicated witness interface with a dedicated route as described here:

https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.vsan-planning.doc/GUID-03204C22-C069-4A18-AD96-26E1E1155D21.html

Now I converted the stretched cluster to a single site and I wanted to remove the dedicated interface. When I try this on one node the vSAN health service complains abut having to separate cluster partitions. By re-adding the witness interface, the alarm goes away, 

What is the correct procedure to remove those vSAN witness interfaces?

 

 

[TheBobkin]

 Can you show the output of the following on the node that you tried removing this? (feel free to change/obfuscate IPs etc.):

#esxcli vsan network list

#esxcli vsan cluster unicastagent list

And can you also indicate what you are removing e.g. are you removing whole vmk or just untagging a service (vsan/witness) from it and if so, which?

[sappomannoz]

I tried again, got the partition warning, but after a couple of minutes it went away,

 

I'm removing the witness traffic from the interface, not the whole vmk:

esxcli vsan network ip remove -i vmk0

I will now post the output of the commands, that I captured before the removal.

 

 

[sappomannoz]

Interface
VmkNic Name: vmk0
IP Protocol: IP
Interface UUID: 52656dea-68e1-186e-7ca9-797f3a2f3372
Agent Group Multicast Address: 224.2.3.4
Agent Group IPv6 Multicast Address: ff19::2:3:4
Agent Group Multicast Port: 23451
Master Group Multicast Address: 224.1.2.3
Master Group IPv6 Multicast Address: ff19::1:2:3
Master Group Multicast Port: 12345
Host Unicast Channel Bound Port: 12321
Data-in-Transit Encryption Key Exchange Port: 0
Multicast TTL: 5
Traffic Type: witness

Interface
VmkNic Name: vmk3
IP Protocol: IP
Interface UUID: 5240662c-6f5e-fe12-0937-9c6041c2335a
Agent Group Multicast Address: 224.2.3.4
Agent Group IPv6 Multicast Address: ff19::2:3:4
Agent Group Multicast Port: 23451
Master Group Multicast Address: 224.1.2.3
Master Group IPv6 Multicast Address: ff19::1:2:3
Master Group Multicast Port: 12345
Host Unicast Channel Bound Port: 12321
Data-in-Transit Encryption Key Exchange Port: 0
Multicast TTL: 5
Traffic Type: vsan

[sappomannoz]

For some reason I'm not able to post the results of the esxcli vsan cluster unicastagent list command. will add it as txt file

Attachment(s)

vsan.txt   3 KB 1 version

[sappomannoz]

At the end I was able to remove all witness interfaces from the 5 node cluster.

Only the first and the fourth removal caused a temporary partition of the cluster that was cleared after a couple of minutes.