7 Replies Latest reply on Jan 13, 2019 3:01 AM by daethan

    2 ssd NVME in Raid 0 slow

    golia20

      hi, I recently mounted an aorus x470 gaming 7 with a cpu rayzen 7 2700x with 2 ssd nvme in raid 0 (samsung 970evo). but when I create the raid 0 and then install windows 10 (driver for detecting the raid to be immed when installing windows), I do a performance test with samsung magican and me from 74.218 in random reading (IOPS), and 59.326 in random writing (IOPS), while I use only one without UEFI and without Raid 0 le performance is noticeably higher, in addition to this you notice the startup speed .. a ssd 850 pro in sata beats me in boot .. it seems absurd, I can think of both the driver given by amd for RAID ..

       

      Any solution?

      Thanks in advance

        • Re: 2 ssd NVME in Raid 0 slow
          golia20

          After 6 hours of testing I still could not find the problem ... it seems to be that the AMD RAID drvier is not comfortable with the ssd 970 evo in raid 0.

          Testing 1 ssd, installing windows 10 and making a benchmark, again on Samsung Magican, the performances are very high ..

           

          On the samsung site there is the driver for nvme m2 but, (rightly) if installed, the AMD RAID drivers are invalidated, and the result is a crash at the start of the operating system..

          • Re: 2 ssd NVME in Raid 0 slow
            golia20

            hi, I read the various answers .. and when I had the problem I realized a bul###it, and true that if you put 2 ssd in raid you have more transfer in MB but IOPS fall .. my problem was that the nvme port M2B was PCIe 2.0 and then do a raid with the restricted bandwidth forced the raid to decrease its performance ... to date I remain disappointed with the decision of gigabyte not to put 2 pci 3.0 in the nvme .. the solution and a card in pcie 3.0 dedicated only to the ssd raid but from what I read in the forum you would have the same problems .. in a way thanks for the answer ..

              • Re: 2 ssd NVME in Raid 0 slow
                daveymcman

                I have a TR4 Threadripper MB, Asus Prime X399-A, which does have pcie 3.0 and it has made no difference whatsoever.

                 

                On my motherboard its the AMD raid implementation not the M.2 NVMe interface or the lack of pcie of which I have 64 lanes!!! and I have one card installed an AMD rx580 graphics card. 

                  • Re: 2 ssd NVME in Raid 0 slow
                    golia20

                    ok, so just to understand, have you used the pcie ports per m2 dedicated motherboard and you have my same problem?

                    if you can then think that the drivers raid amd are not able to handle or that the cpu can not handle all this speed ... because after these attempts I covered a 970 pro and a single ssd m2 I still have problems with IOPS .. (only milder) ..

                     

                     

                    I loose a link to a post on a forum where we talked about this problem ... (in Italian) ..

                     

                    https://forum.tomshw.it/threads/velocit%C3%A0-bassa-samsung-970-pro-512gb.732247/

                      • Re: 2 ssd NVME in Raid 0 slow
                        daveymcman

                        I do not get to allocate pcie lanes to the M.2.  There is a setting in the bios manual which talks about doing this, but it mentions to do this ONLY if you install an M.2 adapter card.

                         

                        Now I have tried both X16 mode and PCIe RAID mode with no difference whatsoever which makes sense, I have no M.2 adapter card in any of the PCIe slots.

                         

                        according to AMD each M.2 gets PCIe x4 directly

                         

                         

                        a single PCIe x4 lane should be able to handle 3.94GB/s  I have two, one for each m.2 drive and they are connected directly to the threadripper processor.  What is the problem!!  The problem is the AMD driver/software.  Its rubbish.  Maybe you have a similar problem with your ryzen 7 2700x.

                  • Re: 2 ssd NVME in Raid 0 slow
                    daethan

                    You can check your connected m.2 speeds using HWINFO. This will work even when configured in raid. It should say gen 3 x4. There is another post here talking about the performance issues with AMD m.2 raid linked below.

                     

                    MSI MEG x399 Creation - 8 NVME bootable raid 0 - Slow Performance