HP EliteBook 8770w RAID User Guide - Page 9
Fault tolerance, copy data to another hard drive. With RAID 1 and Recovery
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RAID levels RAID Recovery RAID 5 Function/Applications Advantages/Disadvantages Function: Advantages: Identical (mirrored) data is Provides high fault stored on two drives. tolerance. Boosts the functionality of RAID 1 with valuable features. Users can choose to mirror data continuously or on request. Applications: Any application that requires a simple data protection method. Data recovery is quick and easy. Allows hot-plugging of mirrored drive (with eSATA or docking station hard drive). Enables easy migration to non-RAID. Disadvantages: Only half of the total drive capacity can be used for storage. Storage space may be wasted if the capacities of the primary and recovery hard drives are different. Function: Advantages: Distributes data across three hard drives. If one hard drive fails, RAID 5 allows data to be recovered from the other two hard drives. Applications: Data redundancy Improved performance and capacity High fault-tolerance and read performance A good choice for large amounts of critical data. Disadvantages: During a RAID rebuild after a hard drive fails, system performance can be decreased. Fault tolerance Fault tolerance is the ability of a RAID array to withstand and recover from a drive failure. Fault tolerance is provided by redundancy. Therefore, RAID 0 has no fault tolerance because it does not copy data to another hard drive. With RAID 1 and Recovery, one drive can fail without causing the array to fail. With Recovery, however, the restoration of a single file or an entire hard drive is much simpler than with RAID 1 alone. With RAID 5, one of the three hard drives can fail without causing the array to fail. RAID modes supported 5