They also mentioned this at some of the ZFS talks at LISA 2008.    The general 
argument is that, while plenty of hobbyists are clamoring for this, not enough 
paying customers are asking to make it a high enough priority to get done. 

If you think about it, the code is not only complicated but will be incredibly 
hard to get right and _prove_ it's right.

Maybe the ZFS guys can just borrow the algorithm from Linux mdraid's 
experimental CONFIG_MD_RAID5_RESHAPE:

http://git.kernel.org/?p=linux/kernel/git/djbw/md.git;a=blob;f=drivers/md/raid5.c;h=224de022e7c5d6574cf46747947b3c9e326c8632;hb=HEAD#1885
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