[Ma-linux] cloning logical volumes

[Przemek Klosowski]

Suppose that we have a Linux box configured with LVMs

/dev/sdd1   *           1          13      104391   83  Linux
/dev/sdd2              14       30394   244035382+  8e  Linux LVM

where sdd2 contains the root filesystem in a logical volue, and sdd1 is 
mounted on /boot.

Suppose that bad sectors start showing up, but the disk is still 
readable. We want to make a copy the data onto a good disk, and throw 
away the bad one. What is the recommended sequence of LVM operations? Of 
course it's wrong to just dd to the new drive, because physical volume 
IDS will be the same and the system will get confused between them.

I know that one can filter out the new drive in /etc/lvm/lvm.conf, but 
even then we'd be dd-ing a live system, so the filesystem might be 
captured incorrectly. The correct way seems to be somehow snapshot the 
old drive onto the new drive using LVM, but in a way that creates 
different PV UUIDs on the cloned volume.