Reproducible panic playing with zpool remove in FreeBSD 11.2-RELEASE.

[Maurizio Vairani]

Il 02/07/2018 16:45, Karli Sjöberg ha scritto:
>
>
> On Jul 2, 2018 15:52, Maurizio Vairani 
> <clover.informatica.it at gmail.com> wrote:
>
>     Hi,
>
>     boot the 11.2-RELEASE installation media in the .
>     Insert an USB memory stick, suppose it is /dev/da5.
>     # gpart create -s GPT da5
>     # gpart add -t freebsd-zfs -a 1m -s 1g da5
>     # gpart add -t freebsd-zfs -a 1m -s 1g da5
>     # zpool create -O mountpoint=/tmp/ztest ztest da5p1 da5p2
>     # cp /bin/* /tmp/ztest
>     # zpool remove ztest da5p1
>
>
> How are you even able to remove a partition in a pool without redundancy?
>
> I would've thought ZFS would complain about that and at least force 
> you to have an '-f' or something in there...
This is a new feature in 11.2-RELEASE. From ZPOOL-FEATURES(7):
device_removal

            GUID               com.delphix:device_removal
            READ-ONLY COMPATIBLE    no
            DEPENDENCIES           none

            This feature enables the    "zpool remove" subcommand to remove
            top-level vdevs,    evacuating them    to reduce the total 
size of
            the pool.