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Restore Distributed Switch on new vCenter if old vCenter is crashed with no backup

Posted on 2016-08-31
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Last Modified: 2016-09-26
Is it possible technically ..to restore my dv switch if i lost[crashed] my old vc with no more backup of dv swicth ?

is there any limitation to version compatibility ?

Can we restore this config from any of Host or somewhere else it is saved ?

Please share best practice to restore dv switch in such case .

Thanks
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Question by:patron
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8 Comments
 
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Expert Comment

by:asavener
ID: 41780656
If you've had to build a new vCenter and attach to the affected hosts, then the DV switch configuration is gone.

The hosts should still have their original configuration, though, so they will continue to pass traffic and existing VMs will continue to run.  You won't be able to move machines between hosts, or change guest network configurations.

To fix this, you will need to create a new DV switch, add a host to it, reconfigure your VLANS, etc.  Then migrate some guests onto the that host and move on to the next host.  Rinse and repeat until all of the hosts are on the new DV switch.
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asavener earned 250 total points (awarded by participants)
ID: 41780800
I had another thought....  Is the SQL database on a separate server?

You could likely install a fresh vCenter into a different database, and then modify the DSN to point to the original SQL instance.  It would then pick up all of the settings from the original installation.
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by:Aaron Tomosky
Aaron Tomosky earned 125 total points (awarded by participants)
ID: 41780809
last time I had to do this was with a 5.5 VCSA and I had to make standard switches, migrate to those, then migrate to new DV Switches. YMMV going direct from dVS to dVS
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LVL 62

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by:gheist
gheist earned 125 total points (awarded by participants)
ID: 41782351
To start with - all ESXi-s keep good configuration. And all your VMs stay running.

Now configure vcenter to access management interfaces
And follow aaron's path from then on.
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Expert Comment

by:compdigit44
ID: 41785210
asavener makes a very good point if your DB server is on another server you just need to do a fresh install and point to the old DB.

On another note, was the vcenter server physical or virtual?
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by:patron
ID: 41787040
have diff db and vc vm.so if my vc is crashed ,I ll prepare new vc on another vm n point it to old db?
will that work simply without any more config?
will that restore all my dv switch config back or if any more config required?
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by:asavener
asavener earned 250 total points (awarded by participants)
ID: 41787715
Yes, that should work.  All configuration data is kept in the database.

It's basically the same as migrating to a different SQL server.

I suggest that you first take a backup of the current vCenter database, so that you can always get back to this state.

https://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2003493
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Expert Comment

by:Aaron Tomosky
ID: 41815714
Reusing the DB server is what saved the dvswitch configuration. Always backup your DB!
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