In-place migration to LVM?

[Malte Forkel <malte.forkel@berlin.de>]

Hello,

I have a data file collection on three hard disks, each with just one partition. The 'primary' partition has the complete directory structure. The two 'secondary' partitions partially mirror that directory structure. There are some data files on the primary partition. For each data file on one of the secondary partitions, there is a soft link to it from the primary partition. Each partition has a couple of GB space left. 

Is it possible to migrate these partitions into one logical volume without loosing or backing up the data? If I had a backup storage large enough to hold all the data ...

Thanks in advance,
Malte