undo LVM

Michel Racic michel.racic at gmail.com
Sun May 16 15:00:02 UTC 2010


Hi Luis

Thanks for the hint, I will research some more to see what exactly the
vgreduce command will do on my disk.

regards Michel

2010/5/16 Luis Paulo <luis.barbas at gmail.com>:
> On Sun, May 16, 2010 at 3:12 PM, Michel Racic <michel.racic at gmail.com> wrote:
>
> 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
>
>> 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
>>>
>>




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