VBoxManage list vms

Creando los discos en Virtualbox para maquina ubuntu18_prueba1

VBoxManage createmedium disk --filename VirtualBox\ VMs/ubuntu18_prueba1/disco1.dvi --size 1024 --format VDI --variant Standard
VBoxManage storageattach ubuntu18_prueba1 --storagectl "SATA" --port 2 --type hdd --medium VirtualBox\ VMs/ubuntu18_prueba1/disco1.dvi 
 
 
VBoxManage createmedium disk --filename VirtualBox\ VMs/ubuntu18_prueba1/disco2.dvi --size 1024 --format VDI --variant Standard
VBoxManage storageattach ubuntu18_prueba1 --storagectl "SATA" --port 3 --type hdd --medium VirtualBox\ VMs/ubuntu18_prueba1/disco2.dvi 
 
VBoxManage startvm ubuntu18_prueba1 --type headless
 
VBoxManage list runningvms

Creamos las particiones

gdisk /dev/sdb
 
gdisk /dev/sdc
 
 
lsblk 
NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
loop0    7:0    0 88.5M  1 loop /snap/core/7270
loop1    7:1    0 89.1M  1 loop /snap/core/8039
sda      8:0    0   10G  0 disk 
├─sda1   8:1    0    1M  0 part 
└─sda2   8:2    0   10G  0 part /
sdb      8:16   0    1G  0 disk 
└─sdb1   8:17   0 1023M  0 part

mdadm

mdadm --create /dev/md0 --level=1 --raid-disks=2 /dev/sdb1  /dev/sdc1
 
mkfs.ext4 /dev/md0
 
mkdir /mnt/raid
 
mount /dev/md0  /mnt/raid/
 
umount /dev/md0  
 
cat /proc/mdstat
 
mdadm --detail /proc/mdstat
 
mdadm --detail --scan
 
mdadm --detail --scan >> /etc/mdadm/mdadm.conf
 
echo '/dev/md0 /mnt/raid ext4 defaults,nofail,discard 0 0' | sudo tee -a /etc/fstab
 
update-initramfs -u
 
reboot

• https://www.digitalocean.com/community/tutorials/how-to-create-raid-arrays-with-mdadm-on-ubuntu-16-04