I haven't had a chance to write and test the zpool.cache copying. I keep
meaning to get to it every day, but pushing it back for lack of time.

The zfs-initramfs script in 16.04 (always) and in 18.04 (by default)
runs a plain `zpool import`.

ZoL 0.7.5 has a default search order for imports that prefers /dev/disk/by-id:

That said, so did ZoL on Xenial (

On my bionic test VM, non-root pools import using whatever name I
created them with. If I use /dev, they import later with /dev. If I use
/dev/disk/by-id, they import later with /dev/disk/by-id. This is true
immediately, and true across reboots.

Root pools seem to behave the same way. My root pool was created using
/dev/disk/by-id per the HOWTO (which I maintain) and is being imported
with /dev/disk/by-id. This is with no zpool.cache, either on the live
system or in the initramfs (which I unpacked to verify).

In other words, I cannot reproduce this on bionic. I'm pretty confident
this is an issue on Xenial, though I haven't re-tested just now to
absolutely confirm. But I will say that on my Xenial laptop at the
moment, my root pool is imported with a /dev name.

In short, I think this is fixed in Bionic, but I'm not 100% sure which
code changed to fix it.

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Packages, which is subscribed to zfs-linux in Ubuntu.

  initramfs-zfs should support misc /dev dirs

Status in zfs-linux package in Ubuntu:

Bug description:
  Right now 'zfs-initramfs', i.e. /usr/share/initramfs-tools/scripts/zfs
  does not support any other directory than /dev for "zpool import ...".
  Therefore even if a pool gets created from a different directory like
  /dev, say /dev/disk/by-id or /dev/chassis/SYS on next reboot /dev will
  be used and thus zpool status will show the /dev/sd* etc. on
  successful import. Beside that now a user does not see the original
  names used in "zpool create ..." the unstable names like "/dev/sd*"
  are shown, which is explicitly NOT recommended.

  The following patch introduces the "pseudo" kernel param named "zdirs"
  - a comma separated list of dev dirs to scan on import - which gets
  used by /usr/share/initramfs-tools/scripts/zfs to honor it.

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