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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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Boot into NVMe drives from USB (lemmy.ml)

submitted 8 months ago by peregus@lemmy.ml to c/linux@lemmy.ml

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Hi all, I've installed Debian in 2 (mdadm RAID 1 formtted with Btrfs) NVMe drives installed into 2 PCIe adapters. The motherboard doesn't support booting from those drives, so I've installed Debian into a USB stick (and it works) and I wanted to add into grub the RAID NVMe drives.

os-prober doesn't see the other Debian installation. fdisk -l shows the 2 nvme drives, but it doesn't see md0:

Disk /dev/nvme0n1: 238.47 GiB, 256060514304 bytes, 500118192 sectors
Disk model: SAMSUNG MZVLQ256HBJD-00BH1
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 16384 bytes / 131072 bytes
Disklabel type: dos
Disk identifier: 0xab581c58

Device         Boot Start       End   Sectors   Size Id Type
/dev/nvme0n1p1       2048 500118191 500116144 238.5G fd Linux raid autodetect


Disk /dev/nvme1n1: 238.47 GiB, 256060514304 bytes, 500118192 sectors
Disk model: SAMSUNG MZVLQ256HBJD-00BH1
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 16384 bytes / 131072 bytes
Disklabel type: dos
Disk identifier: 0x863fc92a

Device         Boot Start       End   Sectors   Size Id Type
/dev/nvme1n1p1       2048 500118191 500116144 238.5G fd Linux raid autodetect


Disk /dev/sda: 14.32 GiB, 15376000000 bytes, 30031250 sectors
Disk model: Ultra Fit
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x1d46a293

Device     Boot    Start      End  Sectors  Size Id Type
/dev/sda1  *        2048 28028927 28026880 13.4G 83 Linux
/dev/sda2       28030974 30029823  1998850  976M  5 Extended
/dev/sda5       28030976 30029823  1998848  976M 82 Linux swap / Solaris

mdadm --detail --scan doesn't output anything. How do I solve this problem?

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[–] deadbeef79000@lemmy.nz 2 points 8 months ago

I do this, except with Ubuntu and a btrfs volume for root.

My motherboard supports UEFI, so it doesn't care where the EFI partition is. It's on a USB stick.

The way I did it was by installing to a SATA SSD and then moving the EFI partition to the usb stick and then substituting the SATA SSD with the NVMe SSD using btrfs.

I think I also needed to use reEFInd temporarily to give me an UEFI shell to do some debugging.

Oh! I also setup systemd-boot so I could trivially boot the kernel directly from UEFI, stored on the EFI partition and avoided grub altogether.