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raid1 mdadm v's lvm



Hi                                                                                                                                             
                                                                                                                                               
I am in the process of rebuilding my server and I am planning my disk usage.  I                                                                
have 2 drives.  Traditionally  I would do                                                                                                      
                                                                                                                                               
4 partitions to make up 4 md's                                                                                                                 
                                                                                                                                               
                                                                                                                                               
md0 /boot ( ~ 500M - I like have space here) sda1 + sdb1                                                                                       
md1 / (~10G) sda2 + sdb2                                                                                                                       
md2 swap sda3 + sdb3                                                                                                                           
md3 LVM PV sda4 + sdb4                                                                                                                         
                                                                                                                                               
from the PV I make a VG and then lots of LV's                                                                                                  
                                                                                                                                               
I have used this sort of set for a while, but what I would like to do is not                                                                   
make md3 and instead use sda4 + sdb4 as 2 PV and then I get the chance to                                                                      
decide which pv is made up of mirrored space and which is not.                                                                                 
                                                                                                                                               
I have some data that I don't really care if it dies/get lost.  I can't do that                                                                
on a lv by lv basis with my original setup.                                                                                                    
                                                                                                                                               
I haven't had much experience with lvm mirrors, should I stick with my original                                                                
setup or go with the new ?                                                                                                                     
                                                                                                                                               
Alex 

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