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root@test-test:~# gdisk -l /dev/sd[abcd]   
GPT fdisk (gdisk) version 0.8.5

Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with protective MBR; using GPT.
Disk /dev/sda: 5860533168 sectors, 2.7 TiB
Logical sector size: 512 bytes
Disk identifier (GUID): BBE0B0F0-543A-4C75-A287-BA0CB6F19928
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 5860533134
Partitions will be aligned on 8-sector boundaries
Total free space is 16 sectors (8.0 KiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1              34          250034   122.1 MiB   FD00 
   2          250035        49078160   23.3 GiB    FD00 
   3        49078161        56890661   3.7 GiB     FD00 
   4        56890662      5860533118   2.7 TiB     FD00 

mdadm --create /dev/md0 --level=1 --metadata=0.90 --raid-devices=4 /dev/sda1 /dev/sdb1 /dev/sdc1 /dev/sdd1 # /boot
mdadm --create /dev/md1 --level=10 --metadata=0.90 --raid-devices=4 /dev/sda2 /dev/sdb2 /dev/sdc2 /dev/sdd2 # /
mdadm --create /dev/md2 --level=10 --metadata=0.90 --raid-devices=4 /dev/sda3 /dev/sdb3 /dev/sdc3 /dev/sdd3 # /swape
mdadm --create /dev/md3 --level=10 --metadata=1.2 --raid-devices=4 /dev/sda4 /dev/sdb4 /dev/sdc4 /dev/sdd4  # /content

root@test-test:~# cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath]
md127 : active raid10 sdb4[1] sda4[0] sdd4[3] sdc4[2]
      5803379712 blocks super 1.2 512K chunks 2 near-copies [4/4] [UUUU]
      [>....................]  resync =  3.7% (214983552/5803379712) finish=31411.4min speed=2964K/sec
     
md1 : active raid10 sdc2[2] sda2[0] sdb2[1] sdd2[3]
      48827392 blocks 512K chunks 2 near-copies [4/4] [UUUU]
     
md2 : active raid10 sdc3[2] sda3[0] sdb3[1] sdd3[3]
      7812096 blocks 512K chunks 2 near-copies [4/4] [UUUU]
     
md0 : active raid1 sdc1[2] sda1[0] sdb1[1] sdd1[3]
      124928 blocks [4/4] [UUUU]
     
unused devices: <none>