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

[Karli Sjöberg]

On July 2, 2018 5:35:28 PM GMT+02:00, Maurizio Vairani <clover.informatica.it at gmail.com> wrote:
>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.

Ah, cool, I didn't know that!

How big is 'bin' then? Because it ought to be smaller than 1 GB for you to remove it, right?

/K

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