Anyone run a NAS (network accessible storage)? Question about RAID options...

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lilshawn:
can confirm, raid5 is the way to go here. especially since you are planning to go with the synology 4 drive unit. not much you can do with a 2 bay unit either mirrored or raid 0 striped.

with 4 drives you get the benefit of speed with disk striping on all drives (like raid 0) with the extra benefit of parity. so losing a drive is not a problem. rebuilding the raid is simple as replacing the drive. (results may vary)

going overboard would be a 4 drive raid 6 with double distributed parity. you could lose 2 drives. not really necessary unless it's mission critical info.

ALTERNATIVELY

you can go unRAID if your device supports it... or you roll your own server (easier than it sounds)

http://lime-technology.com/unraid-server/

shponglefan:
Thanks all. I have a feeling I'll end up going RAID 5. I do want at least some fault tolerance. The point about low probability of HD failure is well made; I've only had one HD myself fail in probably the last decade.

That said, with four HDs going I don't want to risk the chance that if one goes that I'll lose a chunk of data.

behrmr:
You can do RAID5 with 3 drives. If you use 8TB drives with drive 4 as a hot spare and you'll yield 16TB of space. If Drive 4 is in the RAID then you'll get 24TB of space and will sweat it out while you order a replacement drive. That's how most people do it.

I run RAID-1 at home and I have lost drives. Hard drive failure does happen and you should plan for it. I have had the same NAS unit for 4.5 years and have replaced both drives in it during that period of time with no data loss.

shponglefan:

--- Quote from: behrmr on September 09, 2016, 09:43:35 pm ---You can do RAID5 with 3 drives. If you use 8TB drives with drive 4 as a hot spare and you'll yield 16TB of space. If Drive 4 is in the RAID then you'll get 24TB of space and will sweat it out while you order a replacement drive. That's how most people do it.
--- End quote ---

I guess my big question is how much space do I think I'll need. 16 TB seems like a lot, but so did 4 TB back when I set up my original NAS. And especially since I am in the process of digitizing my media collection including a bunch of BluRays, I can see that space going quick...

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