ZFS runs on 32-bit or 64-bit FreeBSD installs.
On 32-bit installs, you have to do a lot of manual tuning to keep things running smoothly, and you are limited to 4 GB of RAM. But it works.
On 64-bit installs, you don't have to do as much manual tuning, you aren't limited to 4 GB of RAM, and things run better.
There's no "ZFS is limited to 64-bit OSes" restriction.
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