OpenZFS
summary
Claims enterprise-grade correctness by design: checksums all data and metadata and uses copy-on-write on-disk format so fsck is unnecessary. Implements RAID‑Z with one to three parity devices and treats SSDs as dedicated cache/log devices to accelerate I/O. Provides zfs send/receive for fast incremental replication and online attach/detach for mirrored EBS recovery. OpenZFS unifies platform ports with a central repo and supports userland builds so fixes flow between FreeBSD Linux and others.
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