[linux-lvm] lvmdiskscan and mouting a LVM2 loopback file

[linux-lvm] lvmdiskscan and mouting a LVM2 loopback file

[Benjamin Henrion]

Hi,

I have setup an LVM device on loopback, but I cannot remember how to
mount it back.

I did an lvmdiskscan:

===============================================
# lvmdiskscan
  /dev/loop0 [      39.06 GiB] LVM physical volume
  /dev/root  [     222.79 GiB]
  /dev/sda5  [       9.45 GiB]
  1 disk
  1 partition
  0 LVM physical volume whole disks
  1 LVM physical volume
===============================================

But I don't know how to detect the logical volumes inside /dev/loop0.

lvdisplay and vgdisplay says:

=================================================
# lvdisplay
  No volume groups found
# vgdisplay
  No volume groups found
=================================================

Any idea how to get the volume and group back?

Best,

--
Benjamin Henrion <bhenrion@ffii.org>
FFII Brussels - +32-484-566109 - +32-2-4148403
"In July 2005, after several failed attempts to legalise software
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Re: [linux-lvm] lvmdiskscan and mouting a LVM2 loopback file

[Bryn M. Reeves]

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On 07/26/2010 08:40 PM, Benjamin Henrion wrote:
> ===============================================
> # lvmdiskscan
>   /dev/loop0 [      39.06 GiB] LVM physical volume
>   /dev/root  [     222.79 GiB]
>   /dev/sda5  [       9.45 GiB]
>   1 disk
>   1 partition
>   0 LVM physical volume whole disks
>   1 LVM physical volume
> ===============================================
> 
> But I don't know how to detect the logical volumes inside /dev/loop0.
> 
> lvdisplay and vgdisplay says:
> 
> =================================================
> # lvdisplay
>   No volume groups found
> # vgdisplay
>   No volume groups found
> =================================================
> 
> Any idea how to get the volume and group back?

Can you post the output of the comand "pvs -a"?

It should look something like this:

sudo pvs -a
  PV         VG      Fmt  Attr PSize  PFree
  /dev/dm-1               --       0      0
  /dev/dm-2               --       0      0
  /dev/dm-3               --       0      0
  /dev/loop0         lvm2 --   32.00M 32.00M
  /dev/loop1 tvg0    lvm2 a-   28.00M 28.00M
  /dev/ram0               --       0      0
  /dev/ram1               --       0      0
  /dev/ram10              --       0      0
  /dev/ram11              --       0      0
  /dev/ram12              --       0      0
  /dev/ram13              --       0      0
  /dev/ram14              --       0      0
  /dev/ram15              --       0      0
  /dev/ram2               --       0      0
  /dev/ram3               --       0      0
  /dev/ram4               --       0      0
  /dev/ram5               --       0      0
  /dev/ram6               --       0      0
  /dev/ram7               --       0      0
  /dev/ram8               --       0      0
  /dev/ram9               --       0      0
  /dev/root               --       0      0
  /dev/sda1               --       0      0
  /dev/sda2  t60_vg0 lvm2 a-   93.03G     0

In that output loop0 is an orphan PV (i.e. it has not been assigned to
any VG yet) and loop1 contains a VG named "tvg0" (sda2 is my system VG).

Regards,
Bryn.

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