Re: zpool labelclear destroys GPT data

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Le 14/06/2013 09:35, Johan Hendriks a =E9crit :
> Kimmo Paasiala schreef:
>> On Fri, Jun 14, 2013 at 12:22 AM, Johan Hendriks
>> <joh.hendriks@gmail.com> wrote:
>>> Op 13-6-2013 14:40, Kimmo Paasiala schreef:
>>>
>>>> The 'device' can be a partition as well as the whole disk, use 'zpoo=
l
>>>> labelclear' on the freebsd-zfs partition instead of the whole disk.
>>>>
>>>> -Kimmo
>>>>
>>>> On Thu, Jun 13, 2013 at 3:29 PM, Johan Hendriks
>>>> <joh.hendriks@gmail.com>
>>>> wrote:
>>>>> When i use zpool labelclear, it wipes the whole disk including gpt
>>>>> data.
>>>>> So the whole disk is empty and i need to create the gpt partitions
>>>>> again.
>>>>>
>>>>> Is this supposed to work like this?
>>>>> The man page suggests that it only wipes the ZFS metadata.
>>>>>
>>>>> zpool labelclear [-f] device
>>>>>
>>>>>            Removes ZFS label information from the specified device.=

>>>>> The
>>>>> device
>>>>>            must not be part of an active pool configuration.
>>>>>
>>>>>            -v      Treat exported or foreign devices as inactive.
>>>>>
>>>>> This is on FreeBSD 9.1 stable r251213 memstick install.
>>>>>
>>>>> regards
>>>>>
>>>>> Johan Hendriks
>>>>> Neuteboom Automatisering
>>>>> _______________________________________________
>>>>> freebsd-stable@freebsd.org mailing list
>>>>> http://lists.freebsd.org/mailman/listinfo/freebsd-stable
>>>>> To unsubscribe, send any mail to
>>>>> "freebsd-stable-unsubscribe@freebsd.org"
>>> Thanks for your reply.
>>> I will try it on the actual zfs partition.
>>>
>>> But imho it is a bad thing that it destroys the whole disk layout.
>>> It does not remove ZFS label information, it removes ALL label
>>> information
>>> on the disk or device you give it
>>>
>>>
>>> regards
>>> Johan Hendriks
>>> Neuteboom Automatisering
>>>
>> Of course, zpool(8) will do exactly what you tell it to do. It does
>> not know about any partitioning schemes and assumes that the user
>> knows that using labelclear on a the whole disk will potentially
>> destroy all data on it including any partitioning information.
>>
>> -Kimmo
> Well as i found out, zpool(8) does not know what it clears. ! :D
>=20
> I think an adjustment to the man page is in order here.
> The man page clearly state it removes ZFS labels, not GPT, gmirror and
> glabel labels.
> It should mention it will remove labels from the disk/device, and that
> it clears ALL labels.

I agree with that, I thought too that zpool cleared only ZFS related
labels. Thankfully no damage for me because it was in a script that wipe
out the entire disk.

> regards
> Johan Hendriks

--=20
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