Just posting this here in case anyone else runs into this.
If you're running a distributed install and you followed vmware's instruction for setting up the external postgressql database you may run into this issue.
There is a step in the instructions that has you change the database password/user on the command line when you're setting up the appliance for database use only. There is nothing more than that about the password.
When you go to upgrade the 6.2.0 appliance to 6.2.1 you will get a failure where it says the pre-install finished but post install and db both fail with (Update failed (code 0-3)
The solution is
1.go to go the GUI on the PostgressSQL appliance,
2. go to the VRA Settings
3. go to database (it should be pointing at itself)
4. Change the password for the vcac user to match the password you set on the command line...
5. Run the upgrade, should go through.
This threw me for a loop because I was under the impression the database setting here was for the VCAC service which is disabled on the external database appliance if you follow the instructions, but apparently this not being set was causing my upgrade to fail.
Hope this helps anyone running into this issue.