I'm running a Linux Server using ArchLinux, mostly for my own development needs.

It runs Arch Linux on a SW-RAID1. There's two disk drives sda and sdb, each with 3 partitions sda1-sda3, sdb1-3.

SDA1+SDB1 and SDA2+SDB2 are SW-RAID1 using dmraid / mdadm.

The system properly detects /dev/md0 and /dev/md1 and will boot from /dev/md0

On /dev/md1 there are 4 Logical Volumes created with LVM:

  • /dev/mapper/vg0-root is mapped to /
  • /dev/mapper/vg0-var is mapped to /var
  • /dev/mapper/vg0-home is mapped to /home
  • /dev/mapper/vg0-swap is mapped to /swap

And obviously the boot device, which is not in an LVM:

  • /dev/md0 is mapped to /boot

Or I should better say is supposed to be mapped to one of these. Because at boot my system isn't able to find vg0-root device. Nor any of the others.

/dev/mapper/control is the only item in /dev/mapper

When booting I get the following messages:

starting device 238
ERROR: device '/dev/mapper/vg0-root' not found. Skipping fsck.
mount: /new_root: no filesystem type specified.
You are now being dropped into an emergency shell.
sh: can't access tty: job control turned off
[rootfs ]#

I can get that repaired by running the lvm tool and then activating the volume group, which it seems to fail by default.

When I boot into the Rescue system (PXE booted minimal Debian system), that one also fails to automap the Volume Group. (i.e. the LVM volumes aren't available in /dev/mapper)

I've got the following HOOKS line in my mkinitcpio.conf:

HOOKS=(base udev autodetect modconf block mdadm_udev lvm2 filesystems keyboard fsck)

And this is the preload line in my /etc/default/grub:

GRUB_PRELOAD_MODULES="part_gpt part_msdos lvm mdraid09 mdraid1x"

Anyone got any idea what I need to configure to activate the volume group by default?

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