[linux-lvm] extracting EXT3 from VG

[linux-lvm] extracting EXT3 from VG

[termeau sebastien]

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Hello,

I have an hard drive image in a file.
If I try to mount it directly using "mount -o loop my_file.img /mnt/my_dd",
fdisk reports
  mount: unknown filesystem type 'LVM2_member'
This image contains a volume group that itself contains 4 logical vol group.
lvscan reports:
  LogVol00  2.94GB
  LogVol03  64MB
  LogVol02  256MB
  LogVol01  2.31GB

I want to extract the ext3 filesystem included in LogVol00 to a file using
something like:
  dd if=my_file.img bs=512 skip=??? count=??? of=my_ext3.img

How can I determine the skip and count parameter to only extract the ext3
filesystem?

Thanks


-- 
Virtue is its own punishment.
  - Aneurin Bevan

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Re: [linux-lvm] extracting EXT3 from VG

[Bryn M. Reeves]

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termeau sebastien wrote:
> Hello,
> 
> I have an hard drive image in a file.
> If I try to mount it directly using "mount -o loop my_file.img
> /mnt/my_dd", fdisk reports
>   mount: unknown filesystem type 'LVM2_member'
> This image contains a volume group that itself contains 4 logical vol
> group.
> lvscan reports:
>   LogVol00  2.94GB
>   LogVol03  64MB
>   LogVol02  256MB
>   LogVol01  2.31GB

Put the image file on a loop device, then activate the volume group it
contains:

losetup /dev/loop0 my_file.img
vgscan
vgchange -ay <vg name>

Then you should be able to access it as normal. Just dd the file system
off the LV device node.

To shut it down:

vgchange -an <vg name>
losetup -d /dev/loop0

Obviously, change loop0 to something else if 0 is already in use.

Kind regards,

Bryn.

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