raid10 in mdadm reports incorrect "Used Dev Size"

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http://serverfault.com – I previously had a raid5 with mdadm using four 2TB drives. I've recently disassembled the raid and created a raid10 with six 2TB drives, but mdadm --detail is showing "Used Dev Size" as only 2TB (the original one disk raid5 parity) instead of the expected 6TB (half of the new 12TB). Q: Is having this field at 2TB instead of 6TB going to be an issue? Even if it might be fine, I still don't like seeing it wrong. I'm using CentOS 6.3 (2.6.32-279.9.1.el6.i686) with mdadm 3.2.3-9.el6.i686 I zeroed all the superblocks when I disassembled the raid5: sudo mdadm --zero-superblock /dev/sda1 Create (HowTos)