Configuring your disks is really two parts

KVM host

I have two identical 16G SSD disks. The partition layout is

sda     16G
sda1   256M type=fd 
sda2 15360M type=fd

sdb     16G
sdb1   256M type=fd
sdb2 15360M type=fd

Raid

md0 raid1 sda1 sdb1 md1 raid1 sda2 sdb2

Luks

md1 luks formatted

LVM

md1 is configured as lvm with a volumegroup called vg1

with two partitons

For my system I have two small SSD disks. They are 16G each. I will use those to install the KVM host on.