ZFS, which is short for Z File System, is an innovative file system that offers top performance for Internet sites and online apps. One of its main advantages is the real-time checksum comparison - each file features a checksum, or a digital fingerprint, and ZFS compares the checksums of all the files between the different hard disks functioning together within a RAID. If any file is broken for some reason on one of the hard disks, it's restored from another drive with the correct checksum. As a result, the integrity of any file stored on a server is ensured constantly. ZFS also functions considerably faster than other file systems, that permits backups to be generated considerably faster and without slowing down the general performance of the whole hosting server. Furthermore, ZFS does not have a set limit for the total number of files which can be stored on a web server while all other file systems have some restriction which may cause problems sooner or later, specifically for script apps that have a large number of files.