I am running Ubuntu 12.04LTS, OS is installed on a small SSD so that should not be an issue when modifying the RAID array(s).
I currently have four 2TB WD Caviar Green drives that I would like get into a RAID10 array (stripe of mirrors, I think). The problem is that I have a little bit over 2 TB of data that I would like to keep, and no good way to back it up. At present, I have them set up as two different RAID0 arrays, and manually copied the data from one to the other just in case.
My other issue is that Disk Utility says that the partitions are misaligned by 506880 and 507392 bytes, and I would like to fix that (if it is indeed an issue at all). I don't really understand the particulars of how Advanced Format drives need to be partitioned.
I do have a 1TB drive in another computer that could be used temporarily, possibly allowing me to have 3 drives to play around with. Not sure if that helps any.