unsupported features in default install about openzfs-docs

[rlaager]

I've definitely tested the Buster guide with encryption (I still have the VM), so obviously the encryption feature exists. Did you forget to enable backports or something? What version of ZFS do you have installed (dpkg --status zfsutils-linux)?

[gYxjuTyK]

You're right, I might have forgot that backports.
libzfs2linux zfs-dkms zfs-initramfs zfs-zed zfsutils-linux 0.7.12-2+deb10u2
apt -s install -t buster-backports zfs-initramfs
...
The following packages will be upgraded:
libnvpair1linux libuutil1linux libzfs2linux libzpool2linux spl-dkms zfs-dkms zfs-initramfs zfsutils-linux
Inst zfs-initramfs [0.7.12-2+deb10u2] (0.8.6-1~bpo10+1 Debian Backports:buster-backports [all]) []
...
I used the debian-live-10.7.0-amd64 iso.

zpool create -o ashift=12 -o feature@encryption=disabled -o feature@project_quota=disabled -o feature@spacemap_v2=disabled -o feature@async_destroy=enabled -o feature@bookmarks=enabled -o feature@embedded_data=enabled -o feature@empty_bpobj=enabled -o feature@enabled_txg=enabled -o feature@extensible_dataset=enabled -o feature@filesystem_limits=enabled -o feature@hole_birth=enabled -o feature@large_blocks=enabled -o feature@lz4_compress=enabled -o feature@spacemap_histogram=enabled -o feature@userobj_accounting=enabled -o feature@zpool_checkpoint=enabled -o feature@resilver_defer=enabled -O acltype=posixacl -O canmount=off -O compression=lz4 -O devices=off -O normalization=formD -O relatime=on -O xattr=sa -O mountpoint=/ -R /mnt bpool mirror /dev/disk/by-id/ata-DISK1-part3 /dev/disk/by-id/ata-DISK2-part3

zpool create -o ashift=12 -o feature@encryption=disabled -o feature@project_quota=disabled -o feature@spacemap_v2=disabled -O acltype=posixacl -O canmount=off -O compression=lz4 -O dnodesize=auto -O normalization=formD -O relatime=on -O xattr=sa -O mountpoint=/ -R /mnt rpool mirror /dev/disk/by-id/ata-DISK1-part4 /dev/disk/by-id/ata-DISK2-part4

But in..
Step 4: System Configuration
6. Install ZFS in the chroot env
..it is not using -t backports ?
EDIT: could be a typo in my /etc/apt/preferences.d/90_zfs file.

[rlaager]

Right, the installed environment uses the 90_zfs preferences file to choose the backports version. It sounds like you've maybe gotten to the bottom of this? I'm going to close this. If you have any further questions, just leave a comment and I'll reopen it.