[linux-lvm] On-disk and LVM internal metadata representation

[Dave Wysochanski]

On Mon, 2007-03-05 at 04:54 -0700, Nallammai S wrote:
> Hi,
> 
> Whats the difference between on-disk metadata and LVM  internal representation? How does LVM map between these two representations?
> 
> Thanks in advance.
> 
> Nallammai.S 
> 

It is different for LVM1 vs LVM2.

LVM2
- text-based on-disk metadata
- format-specific code in lib/format_text

LVM1
- binary on-disk metadata
- format-specific code in lib/format1

If you read the import*.[ch] and export*.[ch] files in the format
specific directories you will get an understanding of the mapping.  I
also found following the label_read() function to be helpful.