[linux-lvm] pecopy or lecopy
Heinz J . Mauelshagen
mauelshagen at sistina.com
Fri May 24 11:26:15 UTC 2002
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.
> `` 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
> linux-lvm mailing list
> linux-lvm at sistina.com
> 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
Mauelshagen at Sistina.com +49 2626 141200
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