Going back to the end of March there has been OpenZFS 2.1 release candidates coming out frequently and with Thursday's 2.1-rc7 release it amounts to seemingly some final code clean-ups and documentation updates. The OpenZFS 2.1-rc7 release brings some man page updates, several FreeBSD specific fixes, fixing some test failures, a write-mostly sums counter implementation as a minor optimization for statistics counters, the systemd zfs-mount-generator has been rewritten in C rather than being a shell script, and other small changes.
OpenZFS 2.1 overall is exciting for its distributed spare RAID "dRAID" functionality, a compatibility property for Zpool feature sets, updated kernel support , and scaling worker threads with CPU core counts .
Those wanting to help with testing of the new 2.1-rc7 release can do so via OpenZFS on GitHub .