ZFS (opens in new tab)

In the previous article , we explored Btrfs—a copy-on-write filesystem built around a single kind of B-tree, where every file, extent, checksum and chunk mapping lives as a tagged item in some tree, and snapshots fall out of the reference-counted extent design. Btrfs took a lot of inspiration from an older system that pioneered most of these ideas: ZFS. ZFS started life at Sun Microsystems in the mid-2000s and now lives on as OpenZFS, ported to Linux, FreeBSD, illumos, and macOS. From the out...