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How dumb would it be to run single-node ceph? (lemmy.ml)

submitted 8 months ago by jkrtn@lemmy.ml to c/selfhosted@lemmy.world

21 comments fedilink hide all child comments

I really want to run ceph because it fits a number of criteria I have: gradually adding storage, mismatched disks, fault tolerance, erasure encoding, encryption, support out-of-the-box from other software (like Incus).

But then I look at the hardware suggestions, and they seem like an up-front investment and ongoing cost to keep at least three machines evenly matched on RAM and physical storage. I also want more of a single-box NAS.

Would it be idiotic to put a ceph setup all on one machine? I could run three mons on it with separate physical device backing each so I don't lose everything from a disk failure with those. I'm not too concerned about speed or network partitioning, this would be lukewarm storage for me.

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[–] bastion@feddit.nl 1 points 8 months ago

No matter what setup you use, if you want redundancy, it'll cost space. In a perfect world, 30% waste would allow you to lose up to 30% of your disk space and still be OK.

..but that extra percentage of used space is the intrinsic cost.