Taking a deeper looks into the repositories that Rockstor is calling from, does the following have anything to do with this issue?..
ZFS™ (Zettabyte File System) is a combined file system and logical volume manager designed by Sun Microsystems.
Fedora releases don’t ship proper ZFS support included to kernel because its license CDDL (Common Development and Distribution License), instead it’s available as a FUSE (Filesystem in Userspace) module (pacakge name zfs-fuse).