https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246750
Bug ID: 246750
Summary: ZFS: Confusing error message when creating ZFS pool on
vdev
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: kwia...@panic.pl
On default FreeBSD configuration (vfs.zfs.vol.recursive == 0) it's impossible
to create ZFS pools on vdevs. When users try to do this they see generic and
confusing error message:
```
# zfs create -V 1G -s zroot/kwiat
# zpool create -f kwiat /dev/zvol/zroot/kwiat
cannot create 'kwiat': no such pool or dataset
```
For someone not experienced in ZFS it will take some time to learn how to
workaround this as it seems it's not documented anywhere. What's more, on Linux
it just works.
My ideas how to improve this:
1) Better error message when vfs.zfs.vol.recursive==0 and backing device is
zvol.
Example: "cannot create 'kwiat': creating pool on zvol is dangerous. See man
zpool(8) for more info."
2) Document it in the zpool(8) manpage in "zpool create" section
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