Wols Lists wrote: > On 21/12/2022 02:47, Dale wrote: >> I think if I can hold out a little while, something really nice is going >> to come along. It seems there is a good bit of interest in having a >> Raspberry Pi NAS that gives really good performance. I'm talking a NAS >> that is about the same speed as a internal drive. Plus the ability to >> use RAID and such. I'd like to have a 6 bay with 6 drives setup in >> pairs for redundancy. I can't recall what number RAID that is. >> Basically, if one drive fails, another copy still exists. Of course, >> two independent NASs would be better in my opinion. Still, any of this >> is progress. > > That's called either Raid-10 (linux), or Raid-1+0 (elsewhere). Note > that 1+0 is often called 10, but linux-10 is slightly different. > > I'd personally be inclined to go for raid-6. That's 4 data drives, 2 > parity (so you could have an "any two" drive failure and still recover). > > A two-copy 10 or 1+0 is vulnerable to a two-drive failure. A > three-copy is vulnerable to a three-drive failure. > > In other words, a two-copy raid-10 might be taken out by a failure > that a raid-6 will survive. A three-copy raid-10 might be taken out by > a failure that will take out a raid-6. Choose your poison :-) > > Cheers, > Wol > > . >
This is why at some point, I'd like to have two sets of backups. RAID or not. If I alternate between the two or update one weekly and the other monthly, odds of both being lost for some reason is slim. Nothing is ever impossible but not very likely. I could even keep the monthly backup, or second backup, in a outbuilding. That would protect from a house fire or something. I have a fire safe but still. I'm hoping that this Raspberry thing will work out. My reasons, I can upgrade easily, change OS and/or software if I want plus I may can even expand to a larger number of drives if needed. Buying a pre-built NAS, I think I'd be stuck with whatever I bought. Most likely no path for upgrade, changing OS and/or software or much of anything else either. Basically, it is what it is when I buy it. Given the info in the video you shared, I think something good is coming as soon as things get back to going again. Thanks again for the link. It lead to some other good videos too. Dale :-) :-)
