The thing I miss most in ZFS (aside from a native in-kernel linux port, as I&#x27;ve found ZoL to be kinda buggy) is to be able to grow zdevs. I can add a new zdev, I can remove them, but I can&#x27;t add one disk to my 7-disk RAIDZ2. MD RAID has no problem with this.<p>Also, if you add zdevs later, you will never get full performance again as the striping will be off (putting more writes on the zdevs with more free space), and there&#x27;s no &#x27;rebalance&#x27; kind of thing (I&#x27;ve seen some scripts that just move stuff around, but I&#x27;ve never seen any evidence that they work, and I really doubt that they do based on my understanding of zdev allocation).