In the section 17.1.3. Setting Up Storage-based Protection of doc <SLE-ha-guide>, it says:
The shared storage segment must not make use of host-based RAID, cLVM2, nor DRBD*.
However, using storage-based RAID and multipathing is recommended for increased reliability.
And, from the https://en.wikipedia.org/wiki/RAID, I only see below types of RAID:
  • Hardware-based RAID
  • Software-based RAID
  • Firmware/dirver-based RAID

So, I do not know what type is host-based RAID and storage-based RAID.

And what's problem will be caused by "host-based RAID"?