[nine_k]

You can upgrade a 2-disk RAID1 to a 3-disk RAID5, then chain them to RAID0 as normal. It gives you a better chance to keep data intact, hopefully without lowering the write speed seriously.

https://en.wikipedia.org/wiki/Nested_RAID_levels#RAID_50_(RA...

[zaarn]

RAID 50 doesn't really solve it, it exposes you to some more risk since you can still die with 2 disks but now you have more disks in each sub array.

The correct answer is either a 3-mirror RAID1 or RAID6.

Bcachefs also promises some solution to this by allowing both erasure encoding and replication to co-exist, according to it's documentation.