Did you know that LVM has built-in support for Intel Optane? Neither did I. It's a manual configuration though and it doesn't seem to be easy to do with BTRFS, so I simply went for EXT4.
Why would you want to enable the Optane cache? It supports super low latency no matter how much you use it while the big NVMe SSD is going to get slower the busier it is.
Note: I'm talking about laptop NVMe SSDs with built-in Optane cache. Mine is a Intel® Optane™ Memory H10 32GB + Intel® QLC 3D NAND SSD 512GB, M.2 80mm PCIe 3.0, which came pre-installed in my HP Spectre x360.
To start:
- Enter the UEFI and turn on ACHI for the SSD (I don't know if I did it as I forgot my UEFI password)