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DragonFlyBSD's HAMMER [0] is another viable alternative.

Unfortunately the next generation HAMMER2 [1] filesystem's development is moving forward very slowly [2].

Nevertheless, kudos to Matt for his great work.

[0] https://www.dragonflybsd.org/hammer/

[1] https://gitweb.dragonflybsd.org/dragonfly.git/blob_plain/HEA...

[2] https://gitweb.dragonflybsd.org/dragonfly.git/history/HEAD:/...

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I had a look at HAMMER as it seemed it might meet my requirements [0] but I couldn't figure out whether it supports replication or erasure coding. Don't suppose anyone here knows?

[0]: https://news.ycombinator.com/item?id=14756787

HAMMER does support replication but it doesn't have erasure coding.

If you are using a recent Linux Kernel I can suggest you to use dm-integrity [0] (optionally with dm-crypt) with your favorite filesystem. It's not erasure coding but it can help detecting silent data corruption on the disk.

[0] https://old.lwn.net/Articles/721738/

Hmm, it does seem like it should be possible to put mdadm on top of dm-integrity devices, I might try that out.

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