Vswitch vs Distributed Switch

mokkan
mokkan used Ask the Experts™
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I can see that Distributed Switch is configured in Vcenter level to  mange multiple ESX hosts and configuration and put the  information in Vcenter database. How about if vcenter goes down, how would it going to work?
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Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017
Commented:
vCenter Server is only used to Configure Distributed Switches.

you should read this

http://www.yellow-bricks.com/2012/02/08/distributed-vswitches-and-vcenter-outage-whats-the-deal/

Author

Commented:
I understand that part, my question where does it keep the information?

Author

Commented:
let me read the article  :)  thank  you
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Commented:
The vDS or Distributed Switches information is kept in the VCenter database.

When I rebuild my HP Blade Server, I'm installing it with my manufacturer ESXi image and then join it to the VCenter.

After joining to the VCenter, you can see that it will automatically populating the Distributed Switche info.
Paul SolovyovskySenior IT Advisor
Top Expert 2008
Commented:
Let's say vCenter is no longer available and you have no way to restore it.  The method we used is similar to the following, essentially backup vDS prior to anything going south, rebuild new vCenter and restore vDS to new vCenter using powerCLI makes it easy

http://vlenzker.net/2016/01/migration-of-a-distributed-switch-to-a-new-vcenter-powercli-edition/

Author

Commented:
Thank  you,  if  I understand correctly,  if  we have distributed switch and if  vcenter goes down,   VMs will be down which we created directly via Vcenter.
Commented:
@Mokkan, no it will not be.

VCenter only save and use for creating the dvSwitch.
Once it is working it will be running in each of the ESXi hosts.

I've rebooted Windows VCenter VM couple of times with no issues to production VMs.
Paul SolovyovskySenior IT Advisor
Top Expert 2008
Commented:
If vCenter goes down VMs will continue to function but you will not be able to make changes to the port groups while vCenter is not available.
VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017
Commented:
Thank  you,  if  I understand correctly,  if  we have distributed switch and if  vcenter goes down,   VMs will be down which we created directly via Vcenter.

No. vCenter Server is only used to Configure Distributed Switches, did you not read or understand the article ?

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