What I Have

1. Current Setup

   • Disk /dev/nvme0n1:
     • Partition 1 (/dev/nvme0n1p1): EFI System, mounted as /boot/efi.
     • Partition 2 (/dev/nvme0n1p2): Linux FileSystem, mounted as /boot.
     • Partition 3 (/dev/nvme0n1p3): LVM, part of ubuntu-vg Volume Group, mounted as /.
   • Disk /dev/nvme2n1:
     • Entire disk is an LVM Physical Volume, also part of ubuntu-vg.

   Output of sudo pvs:

   PV             VG        Fmt  Attr PSize    PFree
   /dev/nvme0n1p3 ubuntu-vg lvm2 a--  <473.89g    0
   /dev/nvme2n1   ubuntu-vg lvm2 a--  <476.94g    0
   

2. New Disk /dev/nvme1n1:
   • Empty, unformatted disk.
   • To be partitioned and used to replace /dev/nvme0n1 and /dev/nvme2n1.

What I Want

1. Disk /dev/nvme1n1 Setup:
   • Partition 1 (/dev/nvme1n1p1): EFI System, 1 GiB, formatted as vfat, mounted as /boot/efi.
   • Partition 2 (/dev/nvme1n1p2): Linux FileSystem, 2 GiB, formatted as ext4, mounted as /boot.
   • Partition 3 (/dev/nvme1n1p3): LVM, occupies the remaining space, part of ubuntu-vg, mounted as /.
2. Complete Migration:
   • All data (including /boot, /boot/efi, and /) migrated to /dev/nvme1n1.
   • GRUB configured to boot from /dev/nvme1n1.
   • /dev/nvme0n1 and /dev/nvme2n1 removed after migration.

What I Do

Step 1: Partition the New Disk

1. Launch fdisk to partition /dev/nvme1n1:

   sudo fdisk /dev/nvme1n1
   

2. Create partitions:
   • Partition 1:
     • Size: 1 GiB.
     • Type: EFI System (t, code 1).
   • Partition 2:
     • Size: 2 GiB.
     • Type: Linux FileSystem.
   • Partition 3:
     • Size: Remaining space.
     • Type: Linux LVM (t, code 8e).
3. Save and exit fdisk (w).
4. Format the partitions:

   sudo mkfs.vfat -F32 /dev/nvme1n1p1
   sudo mkfs.ext4 /dev/nvme1n1p2
   sudo pvcreate /dev/nvme1n1p3
   

5. Add /dev/nvme1n1p3 to the volume group:

   sudo vgextend ubuntu-vg /dev/nvme1n1p3
   

Step 2: Migrate LVM Data

1. Move LVM data from old disks to the new disk:

   sudo pvmove /dev/nvme0n1p3 /dev/nvme1n1p3
   sudo pvmove /dev/nvme2n1 /dev/nvme1n1p3
   

2. Remove old Physical Volumes:

   sudo vgreduce ubuntu-vg /dev/nvme0n1p3
   sudo vgreduce ubuntu-vg /dev/nvme2n1
   sudo pvremove /dev/nvme0n1p3
   sudo pvremove /dev/nvme2n1
   

Step 3: Migrate Boot Data

1. Mount new partitions

   sudo mount /dev/nvme1n1p2 /mnt/target_p2
   sudo mkdir -p /mnt/target_p2/boot/efi
   sudo mount /dev/nvme1n1p1 /mnt/target_p2/boot/efi
   

2. Copy data from old /boot and /boot/efi:

   sudo rsync -avh /boot/ /mnt/target_p2/
   sudo rsync -avh /boot/efi/ /mnt/target_p2/boot/efi/
   

Step 4: Update /etc/fstab

1. Mount the new root Logical Volume:

   sudo mount /dev/mapper/ubuntu--vg-root /mnt/target_root
   

2. Bind /boot and /boot/efi to the new root:

   sudo mount --bind /mnt/target_p2 /mnt/target_root/boot
   sudo mount --bind /mnt/target_p2/boot/efi /mnt/target_root/boot/efi
   

3. Edit /mnt/target_root/etc/fstab:
   • Update UUIDs for /boot/efi, /boot, and / using blkid:

     sudo blkid
     

     Example /etc/fstab:

     UUID=<new-efi-uuid> /boot/efi vfat defaults 0 1
     UUID=<new-boot-uuid> /boot ext4 defaults 0 2
     

Step 5: Install GRUB

1. Enter a chroot environment:

   sudo mount --bind /dev /mnt/target_root/dev
   sudo mount --bind /proc /mnt/target_root/proc
   sudo mount --bind /sys /mnt/target_root/sys
   sudo mount --bind /sys/firmware/efi/efivars /mnt/target_root/sys/firmware/efi/efivars
   sudo chroot /mnt/target_root
   

2. Install GRUB:

   grub-install
   update-grub
   

3. Exit chroot:

   exit
   

Step 6: Verify and Test

1. Set /dev/nvme1n1 as the boot device in your BIOS/UEFI settings.
2. Remove /dev/nvme0n1 and /dev/nvme2n1 from the machine.
3. Boot into the system and verify:

   lsblk
   cat /etc/fstab
   df -h
   

Step 7: Resize the New Volume

1. Extend the LV:

   sudo lvextend -l +100%FREE /dev/ubuntu-vg/ubuntu-lv
   

2. Resize the Filesystem

   sudo resize2fs /dev/ubuntu-vg/ubuntu-lv
   

- DONE -