Help with migration to ProxMox 2.2

Hello,
I have 2 node cluster setup configured and working for replicating with DRBD and LVM.
My question, for speed up my job, it's about migration of phisical server.
I need to resize the hard disk of the server, and I'm searching a solution for shrink disk after conversion.

I explain what I want to do:
- I'm migrating 3 Windows Server 2003, with clonezilla I clone directly from phisical hard disk to virtual hard disk
- after I startup the virtual machine and resize the partitions to the desired dimension leaving free space unformatted
- now my question, if I shutdown the virtual machine exist a command that shrink LVM based RAW disk? Does it loose data on my partition?

Thank you