Ever since my early days using virtualization (KVM and Xen), I have always used LVM to provide virtual disks and it was with great joy (and ultimately caused me to purchase unRAID) to see the LVM module included into the unRAID Linux kernel.   After various tests and wanting to increase performance, I started experimenting with SSD caching and so tested LVM caching as well as bcache by recompiling the kernel.   LVM caching works well and although I have never benchmarked my different confi