undo LVM

[Luis Paulo]

On Sun, May 16, 2010 at 3:12 PM, Michel Racic <michel.racic at gmail.com> wrote:
> Hi Luis and Herman
>
> Sorry, it was late when I answered to the thread I found but I see it
> was Herman that opened the thread...
>
> As my main problem is the LVM and not the encryption, maybe you have some hint.
>
> As its full disk encryption, you can think of just a partition with
> any FS on it that has been added to a LVM group.
>
> Here is the output of the three commands:
> ~# vgdisplay
>  --- Volume group ---
>  VG Name               data
>  System ID
>  Format                lvm2
>  Metadata Areas        1
>  Metadata Sequence No  1
>  VG Access             read/write
>  VG Status             resizable
>  MAX LV                0
>  Cur LV                0
>  Open LV               0
>  Max PV                0
>  Cur PV                1
>  Act PV                1
>  VG Size               931.51 GiB
>  PE Size               4.00 MiB
>  Total PE              238466
>  Alloc PE / Size       0 / 0
>  Free  PE / Size       238466 / 931.51 GiB
>  VG UUID               E9bMha-PSAi-YjNd-dPXi-WSrf-HDdN-jbk1k6
>
> ~# lvdisplay
> ~# pvdisplay
>  --- Physical volume ---
>  PV Name               /dev/sdb1
>  VG Name               data
>  PV Size               931.51 GiB / not usable 3.19 MiB
>  Allocatable           yes
>  PE Size               4.00 MiB
>  Total PE              238466
>  Free PE               238466
>  Allocated PE          0
>  PV UUID               DIPP4J-oNdp-NF46-cPa0-qE3N-enbs-SIIBFX
>
> /dev/sdb is the disk with the encrypted volume on, the process of
> making an LVM out of it was a second so I hope it hasn't overwritten
> any important information.
> Basically I try to find a way to remove the lvm container around and
> normally use this encrypted partition again.
> I still researching with google how LVM works and how I can revert that process.
>
> I'm not sure what lvmremove actually will do to my disk (as the man
> page isn't very helpful) or if there is a possibility to complete the
> lvm setup without data loss (from my current understanding this is not
> possible).
>
> Maybe someone of you have a hint or can point me to a new research
> direction as I'm a little bit lost.
>
> Regards Michel
>
>
> 2010/5/16 Luis Paulo <luis.barbas at gmail.com>:
>> On Sat, May 15, 2010 at 11:47 PM, Michel Racic <michel.racic at gmail.com> wrote:
>>> Hi Luis
>>>
>>> Did you get a solution for your problem?
>>>
>>> I made the same (similar) mistake...
>>> I have a 1TB Data disk that is encrypted with luks (cryptsetup) and I
>>> installed a new SSD disk because my old HD has crashed and wanted to
>>> install lucid lynx on it.
>>> On the partition screen I accidentally added the encrypted partition
>>> to the LVM and have seen it after I accepted the writing of the
>>> partition table to the disk.
>>> Now I have the problem how to revert the LVM part that I can decrypt
>>> my luks partition with cryptsetup again.
>>>
>>> Could you manage reverting LVM to get to your data or finishing LVM
>>> without deleting the content of that disk?
>>>
>>> Best regards
>>>
>>> Michel
>>>
>>
>> Hi, Michel
>>
>> I didn't had any problem with LVM, i think it was Herman.
>>
>> And I don't know anything about encryption.
>>
>> Maybe if you can give more details, like:
>>
>> Do you see the encrypted files, or nothing at all?
>>
>> Post the output of
>> $ sudo vgdisplay
>> $ sudo lvdysplay
>>
>> and of
>> $ sudo pvdysplay
>> pointing out what is the partition you want to rescue.
>>
>> I don't really know if lvm erases the content of the partition when
>> added during install process, it may just be a simple matter of
>> removing it from the lvm. Don't know.
>>
>> Regards
>> Luis
>>
>

Hi, Michel

I think the way will be
http://tldp.org/HOWTO/LVM-HOWTO/removepvsfromvg.html

like in
$ sudo vgreduce data /dev/sdb1

Please wait a little, do wait, to see what other may say about it.

Regards
Luis