So there’s a known bug where upgrading vCSA via the VAMI freezes at 70%…. I was doing a mass upgrade of all my vCSAs in the demo environment at work, and all of them got stuck at 70%.

After reading the Release Notes for 6.0U1b, it turns out it’s a known issue: http://pubs.vmware.com/Release_Notes/en/vsphere/60/vsphere-vcenter-server-60u1b-release-notes.html

New In the vCenter Server Appliance Management Interface, the vCenter Server Appliance update status might be stuck at 70%
In the vCenter Server Appliance Management Interface, the vCenter Server Appliance update status might be stuck at 70%, although the update is successful in the back end. You can check the update status in the /var/log/vmware/applmgmt/software-packages.log file. After a successful update, a message similar to the following is seen in the log file:
Packages upgraded successfully, Reboot is required to complete the installation

Workaround: None.

Anyways, after checking the software-packages.log, I could see the packages upgraded successfully entry so just rebooted the vCSA. All up and working again!

If you want steps on how to upgrade your vCSA, then have a look at my previous blog entry: Upgrading vCenter Server Appliance to 6.0 update 1