ZFS-Root-Mirror

Installation on Ubuntu 24.04 This adds a mirror to an existing Ubuntu ZFS boot drive

HOW

Initial Ubuntu installation

• Install Ubuntu Desktop 24.04

• For the "Erase disk and install Ubuntu" option, click "Advanced Features" and choose "Experimental ZFS"

• Continue install as normal and boot into Ubuntu....

Add second drive

All work will be done from CLI. Open a Terminal.

• Update Ubuntu:

  sudo apt update && sudo apt dist-upgrade
  

• Find the names of your two disks , The first disk will have three / four partitions, (Four , if you have swap memmory)

  ls -l /dev/disk/by-id
  

• Let's set variables for those disk paths so we can refer to them in the following

  DISK1=/dev/disk/by-id/scsi-disk1
  DISK2=/dev/disk/by-id/scsi-disk2
  

Create partitions on second drive

• List partitions , you expect to see three or four of them

  sudo sgdisk -p $DISK1
  

If three:

EFI
boot
root

If four:

EFI
swap
boot
root

• Copy partition table from disk 1 to disk 2:

  sudo sgdisk -R$DISK2 $DISK1
  

Mirror boot pool

• Confirm that disk 1 partition 2 is the device in the bpool by comparing "Partition by-ID" to the device name shown in zpool status: sudo sgdisk -i2 $DISK1 and zpool status bpool

• Add that partition to the pool: for example sudo zpool attach bpool DISK-PART2 /dev/disk/by-id/DISK_PART2

    sudo zpool attach bpool EXISTING-ID /dev/disk/by-id/DISK2-part2, 
  

• Verify with zpool status bpool. You expect to see mirror-0 now, which has been resilvered

Mirror root pool

• Confirm that disk 1 partition 3 is the device in the rpool by comparing "Partition by-ID" to the device nmae shown in zpool status: sudo sgdisk -i3 $DISK1 and zpool status rpool

• Add that partition to the pool: , for example sudo zpool attach rpool DISK-PART3 /dev/disk/by-id/DISK-PART3

      sudo zpool attach rpool EXISTING-ID /dev/disk/by-id/DISK2-PART3
  

• Verify with zpool status rpool. You expect to see mirror-0 now, which either is resilvering or has been resilvered

Install GRUB

Install GRUB on both the disk by sudo grub-install /dev/sda and sudo grub-install /dev/sdb

DONE !!

Try removing HDD1 and boot the machine or remove HDD1 on the live running machine and test does it automatically works with HDD2