Hyper-V & SSD Best Performance

I'm building a Hyper-V host using Windows Server 2012. It will be hosting 3 Hyper-V images.

I have a SSD and a larger standard HD. I cannot fit everything on the SSD.

Performance wise, will I be better off using the SSD for the host OS, or using it for the VHDs?

Answer

Put the host OS on a partition on the standard HD. Leave some space on the standard HD for VM overflow... even if you can fit all of the VMs on the SSD right now, you need to expect some growth.

Then put as much of the VM's as you can on the SSD. This may mean using multiple VHD's per VM, to separate the VM OS from the application hosted on that OS. If you have some applications that lend themselves to this, begin this process now, even if you can fit the whole VM on the SSD. It will make it easier to move later.