Can you also ship an /etc/udev/rules.d/90-zfs-vdev.rules with these
contents?
KERNEL=="sd*[0-9]", IMPORT{parent}=="ID_*",
ENV{ID_FS_TYPE}=="zfs_member",
SYMLINK+="$env{ID_BUS}-$env{ID_SERIAL}-part%n"
This makes GRUB work if the user uses /dev/disk/by-id/x names, which
upstream ZFS-on-Linux recommends. Without that, the user is required to
use /dev/sdx names.
Note that this ONLY supports root-on-ZFS-on-partitions. Using partitions
is what the upstream HOWTO recommends, what the current version of my
HOWTO recommends (but not past versions), how other filesystems are
configured on Linux, and what Solaris and its derivatives use for root-
on-ZFS (which is also the default there).
I fought the good fight trying to make ZFS "wholedisk" root installs a
thing on Linux, but that cannot work well without changes to GRUB. GRUB
is simply not architected in a way to handle this well. (I wrote a patch
to GRUB that makes it work, but it feels hacky and was rejected by
upstream GRUB.) Fundamentally, the idea of giving ZFS the whole disk but
then having ZFS partition the disk and use a partition is just messy.
It's definitely a layering violation.
So for now, I'd like to see Ubuntu support root-on-ZFS-on-partitions. If
circumstances change, it's easy to expand that later. But if you start
supporting root-on-ZFS-on-wholedisk, then you're kinda stuck supporting
that forever. So I'd rather see the conservative approach of only
supporting partitions for now.
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https://bugs.launchpad.net/bugs/1530953
Title:
Support GRUB's native root=ZFS=
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