VCenter Server upgrade from 5.1.0 to 5.1.1

Current version:

VCenter server:       5.1.0 build     880146
ESXi hosts:             5.1.0  build    799733


New version:

5.1. U1a

ESXi software file:  VMware-VMvisor-Installer-5.1.0.update01-1065491.x86_64
VCenter server:       VMware-VIMSetup-all-5.1.0-1123966


There are a lot of blogs and post and documentation on upgrading so i am not going to bore you with screenshots and detailed explanation but just give me short point summary of how my upgrade process:

1. Create snapshot/backup of VCenter Server!
2. Create backup of VCenter Server, SSO and Update Manager database.
3. Copy install ISO to server and attached with virtual iso application like "Daemon tools".
1. I do this because if server is rebooted and you have the ISO attached through Vcenter server client or web client it will loose the connection.
4. Do not perform Simple install!
5. Select each VMware production individually by upgrading vCenter Single Sign On first.
6. Upgrade the new vSphere web client.
7. Login to new web client and under SSO verify that domain is still setup correctly.
8. Upgrade vCenter Inventory Service
9. Upgrade vCenter Server
10. Upgrade vSphere client if needed
11. Upgrade vSphere Update Manager
12. Reboot the server. 
1. (I was on phone with VMware support due to corruption of upgrade and they said  I that reboot is not required until all applications have been installed and completed)

More on the corruption in another blog!