I have 3 PowerEdge C6320 Servers hosting multiple virtual machines running in Hyper-V in each one of them. I want to update the BIOS/Firmware for these physical servers for Meltdown & Spectre patches without any downtime on the VMs.
Let's say that Host A has 3 VMs and Host B has 2 VMs running on Hyper-V. I want to live migrate all 3 VMs on Host A to Host B first before the update to ensure there isn't any downtime.
Is it possible to live migrate back the 3 VMs from the unpatched Host B to the patched Host A?
Is there any concerns that I should know about this process?