1.install SSD and fromat
you can refer to the reference 1.
and I devide ssd into two parts, named “ssdhome” and “ssdhome”
2. mount ssd to /home and /var
sudo fdisk -l
cd /mnt/
sudo mkdir -p ssdhome
sudo mkdir -p ssdvar
sudo mount /dev/nvme0n1p1 /mnt/ssdhome/
sudo mount /dev/nvme0n1p2 /mnt/ssdvar
df -h
sudo cp -r /home/* /mnt/ssdhome/
sudo cp -r /var/* /mnt/ssdvar/
cd /
sudo mv home/ home-old/
sudo mv var/ home-var/
sudo umount /mnt/ssdhome
sudo umount /mnt/ssdvar
sudo mkdir home
sudo mount /dev/nvme0n1p1 /home
sudo mkdir var
sudo mount /dev/nvme0n1p2 /var
cd home
ls
sudo vi /etc/fstab
#enter the following:
/dev/nvme0n1p1 /home ext4 defaults 0 2
/dev/nvme0n1p2 /var ext4 defaults 0 2
sudo mount -a
df -h
References: