Yes, for each node I use 2 Samsung SSDs 850 Pro 512GB in RAID1.
512GB is also the largest CachaCade capacity .

For past 527 days (with 100,0% active cluster!) I used 2 Intel S3500 240GB SSDs in RAID1 for each node and SMART results are:

on "mostly active" node:
F1 155TB
F2 36TB
E9 54%
on "mostly passive" node:
F1 70B
F2 19TB
E9 78%

All these numbers are similar to the expected.

So, I hope for a "peaceful sleep" for the next two-three years.