TM failing saying there isnt enough space when there is TB's free after upg

We have a bunch of 2tb drives linked together via fw800 (OSX Software raid) which is maxing out a 9.1TB in total.
Time Machine correctly states that 5.3tb will be required to backup. However it wont backup claiming that there isnt enough room on the 9.1tb disk which is dedicated to Time Machine.
Take off one of the 2tb disks reducing the array to 7.3tb and it works fine.
Any ideas ?

Yeah we are using the Disk Utility ("Concatenated RAID set") Raid 0. We have been previously backing up without any problems, after adding an extra 2tb drive to the raid set it complains that there isnt enough space to perform the backup.
Take the new drive away and its fine again. It is reporting the right size for the backup set and the right size for the raid set 9.1tb when the new drive is added.
Thanks for the help.

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