How to change raid1 to basic in synology

Change raid1/SHR (two disks only) to basic. Use as your own risk.

  • Eject one of the disk in raid1.
  • cat /proc/mdstat to check the raid status.
  • md0 and md1 are usually synology’s system partitions. So user partitions begin at md2
  • mdadm --grow --raid-devices=1 --force /dev/md2 Force md2 change to a one disk raid i.e. basic.
  • Check the result in DSM.