warnings for silly/pointless raid levels

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Hi,
I recently got into a stick situation because i had a btrfs volume with data in raid1 but metadata as dup. when i removed one of the drives i could not mount as degraded. This was my error as i did not convert the metadata when i converted it from a single/dup volume.

But i wonder if there should be a warning for raid combinations that are probably mistakes. raid1/dup, provides no protection against a failed disk, but uses as much space as if it did. so maybe the tools could have refused to allow it without a --force. 

sam

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