11  lsblk
   15  apt install mdadm
   20  lsblk
   21  parted /dev/sdb/ mklabel msdos mkpart PARTTYPE1 ext4 0.0 100%
   22  parted /dev/sdb mklabel msdos mkpart PARTTYPE1 ext4 0.0 100%
   23  parted /dev/sdb mklabel msdos mkpart primary ext4 0.0 100%
   24  lsblk
   25  sync;
   26  sync;
   27  lsblk
   28  fdisk /dev/sdb
   29  parted /dev/sdb mklabel msdos mkpart primary ext4 0.0 100%
   30  reboot
   31  ldbsk
   32  lsblk
   33  fdisk /dev/sdb 
   34  fdisk /dev/sdb 
   35  lsblk
   36  sfdisk  -d /dev/sdb | sfdisk -f /dev/sdc
   37  sfdisk  -d /dev/sdb | sfdisk -f /dev/sdd
   38  sfdisk  -d /dev/sdb | sfdisk -f /dev/sde
   39  lsblk
   40  mdadm --create /dev/md0 --level=5 --assume-clean --raid-services=3 /dev/sdb1 /dev/sdc1 /dev/sdd1
   41  mdadm --create /dev/md0 --level=5 --assume-clean --raid-devices=3 /dev/sdb1 /dev/sdc1 /dev/sdd1
   42  cat /proc/mdstat
   43  history > history.txt
   44  ls
   45  nano history.txt 
   46  clear
   47  cat /proc/mdstat
   48  mdadm --add /dev/md0 /dev/sde1
   49  cat /proc/mdstat
   50  fdisk
   51  fdisk /dev/md0
   52  lsblk
   53  fdisk /dev/md0
   54  fdisk /dev/md0p1
   55  mkfs.ext4 /dev/md0p1 
   56  mount help
   57  mount /dev/md0p1 /mnt
   58  df -h
   59  history > history2.txt