You can move the transaction logs to a LUN by using the Configuration wizard.
Steps
In the Actions pane, click Configuration wizard.
From the Storage Group/Database list in the Configuration wizard, select the Storage Group or database whose transaction logs you want to move.
From the Disk List, select the drive letter for the LUN or local disk you want to move the transaction logs to.
Click <=>.
The transaction logs for the selected Storage Group or database and LUN gets associated, and the transaction log files are then moved to that LUN when the Configuration wizard moves your data.
Step through the wizard, and review the configuration summary in the Completing the Configuration Wizard page, and click Finish.
Click Start Now.
Note: If you are moving the location of Exchange databases in this step, it could take some time to complete.