Fabian,
Thank you for suggestions. We thought a fast and more durable journal disk would be better.
24 OSD Disks: on 4 nodes:
2000GB Intel SSD DC P3520, 2,5", PCIe 3.0 x4,bulk
NVMe 2.5" in PCIe 3.0, 20nm, MLC, Sequential Read: 1700 MB/s,
Sequential Write: 1350 MB/s, Random Read (100%
Span)...