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nixpkgs/nixos/doc/config-examples/root-on-lvm.nix

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# This configuration has / on a LVM volume. Since Grub
# doesn't know about LVM, a separate /boot is therefore
# needed.
#
# In this example, labels are used for file systems and
# swap devices: "boot" might be /dev/sda1, "root" might be
# /dev/my-volume-group/root, and "swap" might be /dev/sda2.
# In particular there is no specific reference to the fact
# that / is on LVM; that's figured out automatically.
{
boot.loader.grub.device = "/dev/sda";
boot.initrd.kernelModules = ["ata_piix"];
fileSystems = [
{ mountPoint = "/";
label = "root";
}
{ mountPoint = "/boot";
label = "boot";
}
];
swapDevices = [
{ label = "swap"; }
];
}