If I'm not wrong ZFS on root support has been introduced officially from
19.10 (eoan). I'm not sure if this one is still relevant, but with 20.04
I can't reproduce any errors/issues using ZFS as root and zfs-import-
cache.service is working just fine.
If you are still experiencing this problem, can you provide more
details? Did you configure ZFS as root filesystem manually? Which steps
did you follow?
Otherwise I think we can close this one. Thanks.
** Changed in: zfs-linux (Ubuntu)
Status: New => Won't Fix
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https://bugs.launchpad.net/bugs/1786011
Title:
zfs-import-cache.service fails when using ZFS as root partition
Status in zfs-linux package in Ubuntu:
Won't Fix
Bug description:
When using ubuntu 18.04 with ZFS pool that used as the root filesystem
is imported by initramfs, so the systemd job can't import that pool
as it's already imported.
root@worker02:~# systemctl status zfs-import-cache.service
● zfs-import-cache.service - Import ZFS pools by cache file
Loaded: loaded (/lib/systemd/system/zfs-import-cache.service; enabled;
vendor preset: enabled)
Active: failed (Result: exit-code) since Wed 2018-08-08 08:36:22 CEST; 2h
45min ago
Docs: man:zpool(8)
Process: 4044 ExecStart=/sbin/zpool import -c /etc/zfs/zpool.cache -aN
(code=exited, status=1/FAILURE)
Main PID: 4044 (code=exited, status=1/FAILURE)
aug 08 08:36:22 worker02 systemd[1]: Starting Import ZFS pools by cache
file...
aug 08 08:36:22 worker02 zpool[4044]: cannot import 'rpool': pool already
exists
aug 08 08:36:22 worker02 systemd[1]: zfs-import-cache.service: Main process
exited, code=exited, status=1/FAILURE
aug 08 08:36:22 worker02 systemd[1]: zfs-import-cache.service: Failed with
result 'exit-code'.
aug 08 08:36:22 worker02 systemd[1]: Failed to start Import ZFS pools by
cache file.
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