[RndTbl] d-port daisychains and ryzen ecc

Trevor Cordes trevor at tecnopolis.ca
Wed Feb 13 02:00:01 CST 2019

Oh ya, one more:

- NVMe SSD in M.2 (basically an SSD right on the PCIe bus) works great
  in Linux, with a couple of gotchas:

  - If you want to boot from it or use it in raid you need to tell
    dracut to include the nvme modules and load them super early in the
    boot process.  Make a /etc/dracut.conf.d/nvme-before-raid.conf
    with:  force_drivers+="nvme-core nvme"

    Without that your raid will assemble before nvme is availabe and
    the nvme will be kicked from your raid every reboot.

  - nvme drives are not /dev/sdX, they are /dev/nvme*.  That means
    tools (like scripts I've written, hehe) that expect names to be like
    sda will not work without modification.  Looks like the choice was
    taken in the kernel to make these their own class of device rather
    than pretend scsi like most disk interface out there.  This has
    subtle implications for things like smart, raid, sdparm, etc.

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