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This section begins the last series of topics in Module 07 which deal with redundancy, backups, and recovery. In this section we discuss the process of disk redundancy, performance optimization, and recovery using RAID (redundant array of inexpensive disks (or devices)). We begin the discussion by covering fault management and the goal of ensuring availability via redundancy. This usually involves employing spares either in a "hot" or "cold" condition. The lifespan of a device is an important consideration when setting up redundant systems and usually involves examining SLAs from vendors as well as MTTF (Mean Time To Failure) and MTTR (Mean Time To Repair) metrics. RAID is then discussed and is defined as multiple hard drives acting a a single logical unit. We go on to mention that of all the RAID types, the only ones you should concern yourself with are RAID-0, RAID-1, and RAID-5. These various types are covered in detail in the video.