Temporary postpone upgrading OpenZFS to 2.2.0 – 2.2.1 when upgrading to Proxmox 8.1

Add the following pinning rule for APT to pin proxmox to the 2.1.x branch of OpenZFS.

cat << EOF > /etc/apt/preferences.d/zfs
# Hold back on upgrading to OpenZFS 2.2.* due to a bug currently being investigated in 2.1.4*, 2.2.1* – 2023-11-25
Package: zfs-initramfs zfs-zed zfsutils-linux libzfs4linux libzpool5linux
Pin: version 2.1.13*
Pin-Priority: 900

Remember to remove the rule when Proxmox confirms the issues reported (and suspected) plaguing OpenZFS releases 2.2.0 – 2.2.1 are confirmed resolved.

Edit 2023-12-01: A fix has been released. https://www.phoronix.com/news/OpenZFS-2.2.2-Released