During a server upgrade you migrate the root filesystem to an LVM logical volume that resides on a newly-installed PCIe NVMe controller. After reboot the kernel loads but then drops to the initramfs (dracut) emergency shell displaying a message such as:
dracut-initqueue: Warning: /dev/mapper/vgroot-lvroot does not exist
Which of the following actions is MOST likely to restore a normal boot on this system?
Regenerate the initramfs image for the current kernel, making sure the NVMe storage driver is included.
Append the parameter rootdelay=30 to the kernel command line so the device has more time to appear.
Reinstall the GRUB2 bootloader to the disk's boot sector or EFI system partition.
Update /etc/fstab with the new UUID of the logical volume that holds the root filesystem.
The initial RAM disk (initrd/initramfs) is unpacked before the real root filesystem is available and must contain every kernel module and utility needed to locate that root device. Because the root LV now sits on hardware that requires the nvme storage driver, the existing initramfs does not know how to reach the physical disk, so LVM cannot assemble the volume and boot halts in the emergency shell.
Regenerating the initramfs (for example with dracut -f /boot/initramfs-$(uname -r).img $(uname -r) or the equivalent tool on other distributions) rebuilds the image and embeds the NVMe driver, after which the kernel can see the device, assemble the LVM volume, and mount the root filesystem. Re-installing GRUB, editing /etc/fstab, or adding rootdelay= do not insert the missing driver, so they do not correct the failure.
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What is initramfs and why is it important during boot?
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Why does the NVMe storage driver need to be included in initramfs?
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CompTIA Linux+ XK0-006 (V8)
System Management
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