[linux-lvm] How Can I modify the mapping PE to LE??

[조완근 <jowkju@postech.ac.kr>]

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Hello, I'm at the beginning to use LVM in my machine.


 


Could you give any information on the implementation details of LVM and 
device mapper?? More specifically, I want to change the "mapping between PE and 
LE" for some purposes, however I'm just finished to read the manual of 
LVM-HowTO. This means that I'm totally a newbie in LVM and device-mapper. I 
just read some codes on data 
structures in LVM2/lib/metadata/metadata.h, but I can't get more 
information anymore on how they are mapped.


 


I was hanging around the codes in LVM2 source to find the part related 
with the "mapping", I just got to know the mapping information is stored in 
device mapper, not in the LVM. 


 


I'll use LVM for this purpose - I would like to make a program 
to change the mapping relationship between PE and LE in my own. In 
fact, the program's goal is to move an extent in a bad disk to a disk with 
good performance. The movement is done by the extent. In order to do it, I 
definitely, have to know how I can modify the mapping and maybe, the entire 
structure of LVM and device mapper.


 


Could you give me some information on LVM & device-mapper details that 
help me??


- exactly all about the mapping between LE & PE..


I'm totally at the beginning, I'm well prepared to dig in the codes from now 
on, does anyone can help me to run faster??






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