HP StorageWorks MSA2012i HP StorageWorks 2000 Modular Smart Array Reference Gu - Page 252
Comparing RAID Levels
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Comparing RAID Levels Table A-2 illustrates the differences between the different RAID levels. Table B-2 RAID Level Comparison RAID Level 0 1 10 3 5 Min. Number of Drives 2 2 4 3 3 Description Data striping without redundancy Disk mirroring Combination of RAID 0 (data striping) and RAID 1 (mirroring) Block-level data striping with dedicated parity drive Block-level data striping with distributed parity Strengths Weaknesses Highest performance No data protection: if one drive fails all data is lost Very high performance and data protection; minimal penalty on write performance High redundancy cost overhead: because all data is duplicated, twice the storage capacity is required Highest performance and data protection (can tolerate multiple drive failures) High redundancy cost overhead: because all data is duplicated, twice the storage capacity is required; requires minimum of four drives Excellent performance for large, sequential data requests (fast read) Not well-suited for transaction-oriented network applications: single parity drive does not support multiple, concurrent write requests Best cost/performance for transaction-oriented networks; very high performance and data protection; supports multiple simultaneous reads and writes; can also be optimized for large, sequential requests Write performance is slower than RAID 0 or RAID 1 252 HP StorageWorks 2000 Family Modular Smart Array reference guide • August 2008