Comment Re:Why ext4 (Score 1) 226
You can replace all the drives in the array with bigger ones, resilvering after each replacement, and when you get to the last one, poof, you magically have a bigger pool. I certainly won't claim that as terribly efficient, though.
It has its shortcomings, no doubt. But compared to old-school RAID or even LVM, it takes a huge step forward.