HP Xw9300 NVIDIA: RAID Users Guide - Page 9
RAID 1, How RAID 1 Works, Summary of Features and Benefits
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CHAPTER 1 About NVIDIA RAID RAID 1 How RAID 1 Works In a RAID 1 array, every read and write is carried out in parallel across two disk drives. The mirrored-or backup-copy of the data can reside on the same disk or on a second redundant drive in the array. RAID 1 provides a hot-standby copy of data if the active volume or drive is corrupted or becomes unavailable due to a hardware failure. RAID 1 techniques can be applied for high-availability solutions, or as a form of automatic backup that eliminates tedious manual backups to more expensive and less reliable media. Figure 1.2 RAID 1 Array Diagram RAID 1 provides complete data redundancy, but at the cost of doubling the required data storage capacity, resulting in 50% capacity utilization. Performance is roughly the same as for a single drive, although in some instances the dual write may be somewhat slower. Summary of Features and Benefits • Benefits: Provides 100% data redundancy. Should one drive fail, the controller switches to the other drive. • Drawbacks: Requires two drives for the storage space of one drive. Performance is impaired during drive rebuilds. • Uses: RAID 1 is ideal for small databases or any other application that requires fault tolerance and minimal capacity. • Drives: Minimum, 2. Maximum, 2. • Fault Tolerance: Yes NVIDIA Corporation 5
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