Intel AFCSASRISER User Guide - Page 27

Uses Strong Points Weak Points Drives Table 6. RAID 10 Overview Appropriate when used with data storage that requires 100 percent redundancy of mirrored arrays and that needs the enhanced I/O performance of RAID 0 (striped arrays). RAID 10 works well for mediumsized databases or any environment that requires a higher degree of fault tolerance and moderate to medium capacity. Provides both high data transfer rates and complete data redundancy. Requires twice as many drives as all other RAID levels except RAID 1. 4 - 240 RAID 10 Mirror Set Stripe Set RAID Adapter ABCDEF Available Capacity N=# disks C = Disk Capacity Available Capacity = (N*C) /2 A A C C E E B B D D F F Disk Mirror & Data Striping RAID 10 Figure 6. RAID 10 - Combination of RAID 1 and RAID 0 RAID 50 - Combination of RAID 5 and RAID 0 RAID 50 provides the features of both RAID 0 and RAID 5. RAID 50 includes both parity and disk striping across multiple arrays. RAID 50 is best implemented on two RAID 5 disk arrays with data striped across both disk groups. RAID 50 breaks up data into smaller blocks and then stripes the blocks of data to each RAID 5 disk set. RAID 5 breaks up data into smaller blocks, calculates parity by performing an exclusive-or on the blocks and then writes the blocks of data and parity to each drive in the array. The size of each block is determined by the stripe size parameter, which is set during the creation of the RAID set. RAID level 50 supports up to eight spans and tolerates up to eight drive failures, though less than total disk drive capacity is available. Though multiple drive failures can be tolerated, only one drive failure can be tolerated in each RAID 1 level array. Table 7 provides an overview of RAID 50. Intel® RAID Software User's Guide 15