> Sure, but that involves having enough spare disks So long as we are pointing out things: this presumes that the user doesn't have enough space to make the co

> Sure, but that involves having enough spare disks So long as we are pointing out things: this presumes that the user doesn't have enough space to make the copies on their own disks? If one has a 3GB dataset and 9GB of free space, one can easily zfs send/recv that dataset and destroy the old copy. > This way, while the initial expansion is not ideal, it works. Yep. > If you really need the space gains from a wider distribution, you can do this expansion and then do the make a new copy, then replace old copy with a new copy dance... although that's counter productive if you have snapshots. That's why you do a zfs send/recv, instead of a copy. ZFS will copy your snapshots for you!