this post was submitted on 08 Jun 2025
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Someone recently told me about a RAID configuration that can mitigate bit rot but it was a long conversation and I forgot a lot of what they said. I'm currently in the planning stages of setting up my first NAS so if anybody could point me in the right direction that would be pretty sweet.
ZFS has bit rot protection.
I am currently buying hardware for building my first NAS.
For inspiration, this is what I am building:
Case: White Jonsbo N4
CPU: Ryzen 4600G
RAM: Corsair Vengence 32GB DDR4 3600mhz
Boot drive: Crucial T500 500GB nvme drive.
Storage drives: Seagate Ironwolf Pro NT (I have not yet decided of what capacity I will use). PSU: Corsair SF750 (overkill, I know)
I switched to raid z2 from a 6 drive mirror and what an ordeal that was. It's because I had to grow into it and buy drives over time but eventually the mirror was too inefficient.
I moved data around like 5 times all because I still didn't have enough disks to build my new array and keep my data on the system at the same time. And expanding raidz expands parity on all disks but not the data so you have to recopy all your data so it stripes fully.
I had a backup on a DAS but USB is slow and I didn't want to have it be the only copy.
Edit: clarifying my point. I have no regrets. ZFS is awesome. But make the important decisions up front and yes start with the right amount of drives that you need. My whole issue was growing into it and having to make changes after the fact.
I plan on having a raid of 5 drives and a hot spare, with a cold spare next to the NAS.
I am considering 8/10 TB drives, I currently have less than 10 TB of data in my archive.
What are the advantages of the different raid z leves?
Disks that can fail. I can lose 2 and be okay. That gives me time to swap in my spare or order a new one. For a home user imo 2 drive redundancy is plenty but 3 for a 6 drive mirror was too much. These things aren't cheap!
I am learning this now, especially since I will buy several of them.
This will be my most expensive computer I own by far....
But I am trying to buy reliable parts to last me 10+ years and possibly beyond...