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I've never cloned the disks
I had 3 x 320Gb in RAID5 and decided to grow to 3 x 1Tb
The process was, fail one drive, remove it, replace it for the 1Tb drive, rebuild RAID. This was made for all 3 drives.
After this I grew the partitions to accommodate the free space.
I'll try to find something about the uuid's -