The Z File System, or ZFS, is a high level file system that is much better than any other file system available on the market. It is extremely reliable and delivers the absolute best performance for the hosting platforms which use it. What makes it different is that it compares the so-called checksum of all files on the drives which comprise a RAID array in real time and if any file is corrupted, it's repaired instantly. Basically, the exact same site files are stored on two or more hard disks and if there's a problem with a file on one hard disk, a good copy is employed from the other drive to restore that file. By comparison, none of the other commonly used file systems features checksums. ZFS is also considerably faster and its efficiency isn't impacted by the amount of files stored on the servers. The bigger speeds also enable backups to be created faster and more frequently without affecting the functionality of the system.