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.