Mixed RAID on an HP ML350

Sure you can add a RAID 1 to that controller on 2 added drives. Or you can add them and extend the RAID5 to include the new drives and when the rebuild is completed, you can use the extra capacity on the RAID5, though admittedly this method may be a little trickier.

Whichever method suits you can be handled by that RAID controller.

Assuming you are running Windows, here is the link for the Array Configuration Utility that you can use to configure your array.

http://h18023.www1.hp.com/support/files/server/us/download/25481.html