I have a zfs filesystem with 6 vdevs, each in mirror mode with 2x redundancy. I am currently upgrading to higher capacity, such that a single one of the new drives can hold the entire capacity of the current pool.
I'm sure it's impossible since the vdevs are part of the pool already, but I figure I should ask: is it possible to have the data offloaded from the current vdevs so that instead of 6 vdevs I can have only 3? I figure with the new drives this will give me about a 30% increase in capacity while allowing me to do 3x redundancy. I'd rather not have to create a new pool and transfer everything over to that, but I'll do what I have to.