Server with Hyper-V configuration and SSD disks

Hello

I am interested in building a server configuration with hyper-v for demo purposes. (6-7 vms)

In order to run faster the VMs and the core server,

1) is it recommended to add an SATA SDD hard drive for the core ?

I heard it would reduce the hard drive lifetime due to many writes and the performance is not so much greater than standards HDDs.

2) is it recommended to add an SATA SDD hard drive to host the VMs ?

3) is it recommended to add an SATA SDD hard drive to host the VMs considering I will be using Windows Server 2008 R2 on the guests ?

I heard TRIM command is not implemented for old VHD and it is only reserved for VHDx (and Windows Server 2012)

4) what is the impact of SDD lifetime in hosting VMs ?

thanks a lot

Chea-Lie