Comparison between UFS (Unix File System) and ZFS (Zettabyte File System)

UFS – Unix File System	ZFS – Zettabyte File System
UFS is a file system used exclusively with Unix, and all Unix-like operation systems.	ZFS is an  Open Source software that is licensed under the Common Development and Distribution License (or CDDL).
Inodes are created at the time of creating the file system and  are used to refer the files/directories.	Vnodes are created at the time when files/directories are created and are used to refer the files/directories.
Mirroring occurs on the block level.	Mirroring occurs on the data level.
Can have only one snapshot for a same file system.	Can have more than one snapshot for a same file system.
-	ZFS have inbuilt Volume Manager.