I don't know about ZFS but you can't shrink XFS filesystems (opposed to Ext3/4). It may not be the most common use case but I tend to forget about it, used XFS

I don't know about ZFS but you can't shrink XFS filesystems (opposed to Ext3/4). It may not be the most common use case but I tend to forget about it, used XFS as the fs and then got into problems because of that non-feature. http://xfs.org/index.php/Shrinking_Support http://xfs.org/index.php/Shrinking_Support