Need help with formatting a software RAID 5 array with xfs

Hi,
i'm tying to format a software RAID 5 array, using the xfs filesystem with the following command:
# mkfs.xfs -v -m 0.5 -b 4096 -E stride=64,stripe-width=128 /dev/md0
but all I get is the attached error message. It works fine when I use the ext4 filesystem. Any ideas?
Thanks!
http://i.imgur.com/cooLBwH.png
-- mod edit: read the Forum Etiquette and only post thumbnails http://wiki.archlinux.org/index.php/For … s_and_Code [jwr] --

Sorry I numbered them to show the flow of information, this was also just a place for me to store info as I worked through it. I managed to get it to work by creating a partition that takes up the whole drive and is actually 22 GB larger than all the other drives (since I found out that the had root, swap and home partitions that are no longer needed).
I should be able to resize the other partitions without a problem, correct? They're EXT4. Should I unmount the raid array and do them individually, remount the array, let it sync and do the next? Or just unmount the array, resize all of them, mount it and let it sync?

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