Diff’ing NetBSD and FreeBSD ZFS zpool features

I’ve been backing up my home directories on my NetBSD machines to my FreeBSD backup server using rsync(1). But I’ve been experimenting with using ZFS for /home on NetBSD, so I thought it made sense to use zfs send for backups to the FreeBSD machine instead. But there’s a caveat here. NetBSD’s ZFS only includes support for a subset of the features that OpenZFS on FreeBSD provides. Therefore, if this pool is intended to be used with NetBSD, the FreeBSD zpool should be created with only the features NetBSD supports. According to NetBSD’s zpool-features(7) manpage, the following zpool features are supported: async_destroy bookmarks enabled_txg embedded_data empty_bpobj extensible_dataset filesystem_limits hole_birth large_blocks lz4_compress multi_vdev_crash_dump sha512 skein spacemap_histogram I assumed this coincided with the feature list imported from illumos in 2020, and a look at the list in the following file on FreeBSD confirms this: /usr/share/zfs/compatibility.d/2020 So to build…