LUN migration within the storage using veritas volume manager

Hi,

Can any one know, howt to migrate a lun to another lun in HP XP24K storage. i am  using windows 2008 server running veritas storage foundation 5 and volumes are replicating using VVR.

i need to do it online or offline but at the end the replication should not corrupt after migrating the lun.

config details are:

one a disk group created with 6 ldevs ( 2 for .MDF files, 3 ldevs for .LDF files, 1 ldev for SRL volume - using MS SQL 2008)

i want to migration 3 LDEVS which is using for .LDF files

Please help on this....

thanks,

Veera