The best replacement for mdadm is zfs.

The best alternatives to mdadm are rated as following:
★★★★★  zfs
★★★★★  lvm
★★★★  hardware raid
★★★★  snapraid
★★★★  dmraid
★★★  btrfs
★★★  fakeraid
★★  unraid
★  raidz
  lvm mirror
  dmsetup
  raidtools

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Google Trends

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mdadm
zfs
lvm