Testing shows that RAID 0 with SSD drives does not perceptively increase read/write speeds. The creator of the APOLLO III Solo Node mentioned that he was interested in implementing the "mirror drive" feature sometime earlier in the development process. I am still intrigued, and looking forward to seeing it. It would increase local data security.
Hm... RAID 0 can significantly improve performance, although with NVMe drives the gains are often minimal because a single drive may already saturate the available bandwidth. So that's a fair point.
As for RAID 1, I don't see much value in it for a Bitcoin node. The blockchain is already replicated across thousands of nodes worldwide, so there's little benefit in mirroring it locally. For storing only the blockchain, RAID doesn't provide much practical advantage.
"It would increase local data security."
Only if the drive also stores your own important data. For a dedicated blockchain drive, RAID 1 simply doubles the SSD space and write wear for little real benefit. I'd rather keep a second NVMe as a spare and replace the primary drive when it eventually fails, instead of wearing out both drives at the same time. If they're identical models with similar usage, they may even fail around the same period, reducing perceived protection RAID 1 is supposed to provide.
