> I think "zfs mount -a" should NOT try to mount datasets with
> mountpoint "/"
There is no need for this to be (confusingly, IMHO) special-cased in
zpool mount.
You should set canmount=noauto on your root filesystems (the ones with
mountpoint=/). The initramfs handles mounting the selected root
filesystem.
** Changed in: zfs-linux (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1852793
Title:
Various problems related to "zfs mount -a
Status in zfs-linux package in Ubuntu:
Invalid
Bug description:
I boot from ZFS since the begin of the year. I have a multi-boot situation
with:
- Ubuntu 19.10 with Virtualbox booting from ZFS
- Ubuntu Mate 19.10 with QEMU/KVM booting from ZFS
- Ubuntu 19.10 booting from ext4
I have two problems with zfs:
- the last update of zfs failed, because the dataset "/" was not empty. Of
course it was not empty, it contained the second OS e.g. Ubuntu Mate.
- during startup my datapools were not mounted, that is a regression, since
approx a month I have that issue.
Both I can solve by changing the mountpoint for the other system from
"/" to e.g. "/systems/roots/mate". Afterwards the update has been
executed without problems and the system rebooted with the datapools
mounted as expected.
I think "zfs mount -a" should either
- NOT try to mount datasets with mountpoint "/", except their own system or
- change the error into a warning and continue the mount process or
- set the mountpoints in /boot/grub.cfg by changing etc/grub.d/10_linux_zfs.
The advantage of the last one is, that the other OS is accessible by a file
manager, exactly like in an ext4 multi-boot situations.
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