Yes, I have a suggestion: Don't waste your time using RAID; it is NOT going to improve your SSD throughput.
- The transfer rate of a PCIe lane is 8GT/S. The theoretical throughput of a x4 PCIe connection is 3.94GB/s.
- The 4 PCIe lanes routed to each of the two M.2 connectors come from the Platform Controller Hub (PCH) component.
- The CPU communicates with the PCH via a DMI 3.0 link. This link is equivalent to 4 PCIe lanes. That is, overall theoretical throughput is 3.94GB/s.
- The throughput of the DMI 3.0 link is used by the PCH to support *many* interfaces. This includes: the two x4 PCIe M.2 connectors, the x1 PCIe M.2 connector for WiFi, the x1 PCIe for the SD Card Controller, the x1 PCIe for the GbE Controller, USB-C (USB 3.0), 6 USB 3.0, 2 USB 2.0, two SATA 6.0Gb/s lanes, the LPC Bus (connection to Super I/O component), the SPI bus and the I2S connection to the Audio CODEC.
Needless to say, with all of these devices and interfaces vying for the throughput of the DMI 3.0 link, there is little chance of getting the theoretical throughput of 3.94GB/s to one of the M.2 NVMe SSDs, let alone that required for overlapped operations to two M.2 NVMe SSDs. Bottom line, enabling RAID is a complete waste of time. It is NOT going to improve your throughput.
Sorry, but this is reality...
Thanks for the technical explanation. That definitely helps me understand the limitations.
My primary reason for the RAID 0 array was having a single 1TB volume to run windows... I hate having two drives.. any performance improvement was a secondary benefit.
Most concerning is why the disk tool is hanging my system.... not so much the reported values.
If I can expect to have system stability issues with this kind of setup, I'll convert back to two individual volumes in a heartbeat.
I MAY have found the stability issue... I was trying to tweak the RST settings and changed the value below to DISABLED.... Once I switched it back to ENABLED, my system seems 100% stable... But, as mentioned previously, if I can believe the Crystal Disk Mark scores......... my system is SLOWER in a RAID 0 setup then as individual drives. I'm leaning towards just going back to an individual setup.