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M2 NVME not recognized as such - very bad performance

us flag

I have two M2 SSDs installed. One from Western Digital (WD) and one from Samsung. I tested the speed with hdparm and dd. The WD disk is very slow with read and write between 30-150 MB/s. So there must be something wrong. Already swapped the slots on the board and checked for a firmware update. Same problem.

I saw using "lsblk" that the Samsung is shown as "nvme" while the WD is shown as "/dev/sda". Does someone have an idea how to debug this? Is the WD disk falsely recognized as a "normal" disk? And "lsh" shows some differences too.

WD (listed under scsi):

     *-scsi:0
      Physische ID: d
      Logischer Name: scsi1
      Fähigkeiten: emulated
    *-disk
         Beschreibung: ATA Disk
         Produkt: WDC  WDS500G2B0B
         Hersteller: Western Digital
         Physische ID: 0.0.0
         Bus-Informationen: scsi@1:0.0.0
         Logischer Name: /dev/sda
         Version: 20WD
         Seriennummer: <omitted>
         Größe: 465GiB (500GB)
         Fähigkeiten: partitioned partitioned:dos
         Konfiguration: ansiversion=5 logicalsectorsize=512 sectorsize=512 signature=aef2cc84

Samsung (listed under pci):

           *-storage
            Beschreibung: Non-Volatile memory controller
            Produkt: NVMe SSD Controller SM981/PM981/PM983
            Hersteller: Samsung Electronics Co Ltd
            Physische ID: 0
            Bus-Informationen: pci@0000:02:00.0
            Version: 00
            Breite: 64 bits
            Takt: 33MHz
            Fähigkeiten: storage pm msi pciexpress msix nvm_express bus_master cap_list
            Konfiguration: driver=nvme latency=0
            Ressourcen: irq:16 memory:ed100000-ed103fff
          *-nvme0
               Beschreibung: NVMe device
               Produkt: SAMSUNG MZVLB256HAHQ-000H1
               Physische ID: 0
               Logischer Name: /dev/nvme0
               Version: EXD70H1Q
               Seriennummer: <ommitted>
               Konfiguration: nqn=nqn.2014.08.org.nvmexpress:144d144dS425NX0M185485      SAMSUNG MZVLB256HAHQ-000H1 state=live

Any help is appreciated. Thanks

EDIT: Made more tests. Seems the SSD has a problem. Will return.

Nmath avatar
ng flag
This is an English language site, so please change your system language before running commands with outputs you will need to post here as details. `/dev/sdX#` and `/dev/nvme#` are mount points. They have nothing to do with whether a drive is NVMe or any other device specification
in flag
The WD storage device [uses a SATA interface](https://www.westerndigital.com/products/internal-drives/wd-blue-sata-2-5-ssd#WDS250G2B0A) rather than NMVe, so the `/dev/sdX` assignment is correct. That said, throughput is expected to be about 500MB/sec for sustained operations
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