[linux-lvm] pecopy or lecopy

Heinz J . Mauelshagen mauelshagen at sistina.com
Fri May 24 11:26:15 UTC 2002

Hi Anand.

On Wed, Apr 17, 2002 at 01:39:28AM +1000, Anand Kumria wrote:
> Hi there,
> Quite some time ago, Heinz assisted me with a partial recovery of
> data from one of my LVM volumes. In the meantime I've managed to
> reconstruct a lot of it but have discovered there are one or two
> items I need to get back from the original.
> I'm using LVM tool 1.1rc1 reports:
> caliban:~# vgscan
> vgscan -- reading all physical volumes (this may take a while...)
> vgscan -- found active volume group "caliban"
> vgscan -- only found 11364 of 11520 LEs for LV /dev/caliban/h2
> vgscan -- "/etc/lvmtab" and "/etc/lvmtab.d" successfully created
> vgscan -- WARNING: This program does not do a VGDA backup of your volume group
> If I try and mount the h2 filesystem my kernel opps as the first 150
> PE<->LE mappings don't exist. Has anyone written a tool that copies
> either PEs or LEs from disk without mounting the affected partition?

Not that I am aware if.

A tool to extract accessable LEs of a LV basically needs to:

- run "lvdisplay -Dv /dev/caliban/h2" in order to retrieve all
  physical volumes and extents of the LV

- pvdisplay -v on all of the PVs to get the mapping and run
  dd commands for every extend which name the output files per le

Attached script, which *needs* 1.1-rc tools to run, tries this:

Tell me, if it is of any use for you.

Heinz    -- The LVM Guy --

> That would allow me to salvage more of the data. I'm at the point where
> writing the code myself is an option if only I got some pointers. I'm
> unclear on where the mapping from LE<->PE<->disk blocks is stored. Plus
> I'm finding it confusing trying to see which version of the on-disk metadata
> LVM is using.
> Thanks,
> Anand
> -- 
>  `` We are shaped by our thoughts, we become what we think.
>  When the mind is pure, joy follows like a shadow that never
>  leaves. '' -- Buddha, The Dhammapada
> _______________________________________________
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> linux-lvm at sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html

*** Software bugs are stupid.
    Nevertheless it needs not so stupid people to solve them ***


Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Am Sonnenhang 11
                                                  56242 Marienrachdorf
Mauelshagen at Sistina.com                           +49 2626 141200
                                                       FAX 924446
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