I was working on some ESXi upgrades recently. We’re currently preparing everything to make the upgrade to vSphere 7 somewhen smooth as silk. That means that we’re rolling out vSphere 6.7 on all of our systems. Recently, I was tasked to upgrade some hosts in a facility some hundred miles away. The task itself was super easy, managing that with vSphere Update Manager was working like a charm. But before the vSphere upgrade, I had to upgrade the BIOS and server firmware to make sure that we’re fine with the VMware HCL.
The second host was done within one hour and received the complete care package. But the first host took a bit longer due to unforeseen troubleshooting. I’d like to share some helpful tips (hopefully they’re helpful).
As mentioned, upgrading the ESXi host through the vSphere Update Manager worked like a charm. But before that, I booted the server remotely with the Service Pack for ProLiant ISO image to upgrade the BIOS and firmware of that server. Also, that went very well and. As there are two ESXi hosts at this location, we had shared storage available and we were able to move the VMs from one host to the other without further issues. One host placed into maintenance mode, upgrade, remove from maintenance mode, and the same for the second server. That was the idea.