Adaptec 3405 User Guide - Page 89
RAID 6 Arrays, a RAID 60 array-also known as dual drive failure - slow
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Page 89 highlights
Appendix B: Understanding RAID ● 89 RAID 6 Arrays A RAID 6 array-also known as dual drive failure protection-is similar to a RAID 5 array because it uses data striping and parity data to provide redundancy. However, RAID 6 arrays include two independent sets of parity data instead of one. Both sets of parity data are striped separately across all disk drives in the array. RAID 6 arrays provide extra protection for your data because they can recover from two simultaneous disk drive failures. However, the extra parity calculation slows performance (compared to RAID 5 arrays). RAID 6 arrays must be built from at least four disk drives. Maximum stripe size depends on the number of disk drives in the array. Disk Drive 1 250 GB Drive Segment Size (Smallest Disk Drive) Disk Drive 2 250 GB Disk Drive 3 400 GB Disk Drive 4 400 GB Disk Drives in Logical Drive Disk Drive 1 1 P1 ... P2 Disk Drive 2 2 P2 ... 449 Disk Drive 3 P1 3 ... P1 Unused Space = 150 GB Disk Drive 4 P2 4 ... 500 Unused Space = 150 GB Based on the drive segment sizes used: RAID 6 Logical Drive = 500 GB plus parity (P1 & P2) RAID 60 Arrays Similar to a RAID 50 array (see page 88), a RAID 60 array-also known as dual drive failure protection-is built from eight disk drives configured as two or more RAID 6 arrays, and stripes stored data and two sets of parity data across all disk drives in both RAID 6 arrays. Two sets of parity data provide enhanced data protection, and striping improves performance. RAID 60 arrays also provide high data transfer speeds.
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