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

submitted 8 months ago by [email protected] to c/[email protected]

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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[–] [email protected] 3 points 8 months ago (1 children)

Since you are talking mismatched disks, I have gone to unraid after running a ceph cluster. I found it easy to keep adding and upgrading disks in unraid where it made more sense than maintaining or adding nodes. While I like the concept of being able to add nodes for very large storage arrays. My current unraid server is 180tb.

It is super simple to add/upgrade the storage one disk at a time.

[–] [email protected] 0 points 8 months ago (1 children)

Oh, neat, I'll have to look into that more. It's able to have some redundancy and does some sort of rebalancing on disk failures?

[–] [email protected] 1 points 8 months ago

It has parity disks, which always need to be the largest disks in your array. You can run with either a single one double parity disk.

It seems to work well, as that's how I've had to replace a dozen disks in the last year upgrading from 8tb disks to 18 or 22tb disks.