HP D5970A Installation and configuration of the HP NetRAID, NetRAID-1 and NetR - Page 32
Table 2-2. RAID Level Summary for Spanned Arrays, RAID Level, RAID 10, RAID 30, RAID 50
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Chapter 2 RAID Overview Table 2-2. RAID Level Summary for Spanned Arrays RAID Level Also Known As Fault Tolerance Redundancy Type Hot Spare Option Disks Required: spans 2 arrays spans 3 arrays spans 4 arrays Usable Capacity Capacity Reduction Read Performance Random Write Performance Sequential Write Performance Typical Usage RAID 10 striping with mirrored arrays yes duplicate yes 4 6 8* least 50% intermediate intermediate intermediate Mostly small random writes with fault tolerance and enhanced speed RAID 30 striping with dedicated parity drives yes parity yes 6, 8, 10, 12, 14, or 16* 9, 12, 15, 18, 21, or 24* 12, 16, 20, or 24* intermediate capacity of one disk for each array spanned fast slowest slow Mostly large serial transfers with fault tolerance and enhanced speed RAID 50 striping with distributed parity yes parity yes 6, 8, 10, 12, 14, or 16* 9, 12, 15, 18, 21, or 24* 12, 16, 20, or 24* intermediate capacity of one disk for each array spanned fast slow slowest Mostly small, random transfers with fault tolerance and enhanced speed *The maximum number of devices per adapter depends on the number of channels and types of enclosures being used. Internal channels support a maximum of six devices, and external channels support a maximum of six to eight devices. 24