Cloud storage doesn't mean one gigantic filesystem. ZFS can easily handle as many drives as you can fit in one machine and if you scale horizontally then that'

Cloud storage doesn't mean one gigantic filesystem. ZFS can easily handle as many drives as you can fit in one machine and if you scale horizontally then that's all you have to worry about. It also provides checksumming, compression, and ease of management which are really important on a large scale. If you need a single 2 PB filesystem then you should look elsewhere, but if you need a local filesystem I don't think there's anything better than ZFS right now.