Reconfiguring existing ESXi hosts to join vDS with no downtime to running VM ?

Senior IT System Engineer
Senior IT System Engineer used Ask the Experts™
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Hi All,

I noticed that when I perform vMotion, I got this error or warning message:

vDS warning ?
How to fix that issue above without causing VM downtime and ensure I got no problem when performing manual vMotion or Fully Automated DRS ?

Thanks in advance.
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Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017
Commented:
No downtime, Migrate VMs off first.

but you may experience a moment of outage.

Author

Commented:
Hi Andrew,

but you may experience a moment of outage.
,

yes, I can just evacuate the whole ESXi server by putting it into maintenance mode.
But how do I join it to the vDS without causing impact on any other existing servers / VMs in production ?
VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017
Commented:
Adding a new host to a cluster and vDS, should not impact other hosts or VMs in production.
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Author

Commented:
Thanks Andrew,

So if I add it to the current vDS switch do I have to put my ESXi host to maintenance mode?
Is there anything that I need to be aware of before adding it into the vDS ?
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017
Commented:
I would recommend any changes made to any host, the host is put into Maintenance Mode, to stop VMs being moved to it, whilst you make changes to configuration.

Make sure you know, where all the physical network interfaces on the host you are adding connect, work, documented VLANS etc

Author

Commented:
OK, do they have / must all be identical in terms of Brand or NIC ports ?
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017

Commented:
no.
With vCenter 6 one of the new feature was the ability to vmotion across vDS's. Sometimes I have run into issues do this because of vDS label mismatches. TO get around this I do the following and have done the more times then I can remember..

I am assuming our vDS port groups have multiple vmnic's  if so do the following

1) On the source host, remove one vmnic from the current vDS
2) Assigned the removed vmnic in step 1 to the vDS used by the target host
3) On the VM, update the vDS port group to use that of the target host
4) Vmotion the VM to the target host

And that's it, VM is moved with no downtime
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017

Commented:
Do you require any additional help, to select a solution and close this question.

Author

Commented:
Thanks !

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