[linux-lvm] Where are the data blocks of an LV?

Stuart D Gathman stuart at gathman.org
Tue Jul 26 18:22:49 UTC 2022

Checkout https://github.com/sdgathman/lbatofile
It was written to identify the file affected by a bad block (so it goes
the opposite direction), but the getpvmap() function obtains pe_start and 
pe_size plus the list of segments.  findlv() goes through the segments to
find the one an absolute sector is in.  That should tell you what you want 
to know.

On Fri, 22 Jul 2022, Marcin Owsiany wrote:

> I know that it is possible to find where a given logical volume's extents
> start on a PVs thanks to the information printed by lvdisplay --maps.
> I was also able to experimentally establish that the actual data of an LV
> starts one megabyte after that location. Is that offset documented anywhere,
> or can I somehow discover it at runtime for a given LV?

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