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RAID 10 : Spanning two RAID 1’s Spanning two RAID 1’s - writing duplicate data to more than one pair of drives to protect against data loss in the event of a up to two disk failures (one per array) Definition Yes Fault Tolerance Minimum 4 / Maximum 16 Drives
Environments that require 100% redundancy of mirroring (RAID 1) and the enhanced I/O performance of stripping (RAID 0)
Ideal for smaller organizations needing a high degree of fault tolerance and moderate to medium capacity.
Requires half the available disk space for data redundancy
Same as RAID level 1.
Optimized for both fault tolerance and performance
Provides both high data transfer rates and complete data redundancy
RAID 50 : Spanning two RAID 5’s Data is “striped” across multiple drive groups (super drive group). For data redundancy, drives are encoded with rotated XOR redundancy. RAID 50 provides the features of both RAID 0 and RAID 5. RAID 50 includes both parity and disk striping across multiple drives. Definition Yes Fault Tolerance Minimum 6 Drives RAID 50 works best when used with data that requires high reliability, high request rates, and high data transfer and medium to large capacity. Uses Requires at least twice as many parity drives as a single RAID 5. Drawbacks RAID 50 provides high data throughput, data redundancy, and very good performance. Benefits
RAID 0+1 Enhanced Mirroring The controller combines the performance of data striping (RAID 0) and the fault tolerance of disk mirroring (RAID 1). Data is striped across multiple drives and duplicated on another set of drives. Definition Yes Fault Tolerance Minimum 4 Drives If a drive fails, the controller uses the parity drive to recreate all missing information. Uses Requires half the available disk space for data redundancy, the same as RAID level 1. Drawbacks Optimizes for both fault tolerance and performance. Provides excellent performance for all data needs. May be simultaneously used with other RAID levels in an array. Benefits