The Veritas 5U84 Primary Storage Shelf uses dual, hot swappable RAID Controllers. These Controllers create and manage the 5U84 Primary Storage Shelf disk drive RAID arrays that contain backed up data. The RAID Controllers run RAID levels 6 and 10 on the storage shelf. RAID 10 is also referred to as RAID 1+0. RAID 6 offers high level of data protection. It allows simultaneous write operations, while also allocating two sets of parity data across the drives that comprise the RAID 6 array. RAID 10 uses mirroring and striping technology without the use of parity. It enables the creation of large high-performance disk groups for data storage purposes, while also providing the fault tolerance protection that mirroring offers. The RAID Controllers also provide one SAS3 port.