Adaptec 2130SLP User Guide - Page 172
RAID 6 Logical Drives
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Appendix D: Understanding RAID ● 171 RAID 6 Logical Drives Note: RAID 1E is an upgrade feature; if the RAID 1E feature is locked, see Adding Enhanced Features on page 21 for information on purchasing a feature key. A RAID 6 logical drive is similar to a RAID 5 logical drive because it uses data striping and parity data to provide redundancy. However, RAID 6 logical drives include two independent sets of parity data instead of one. Both sets of parity data are striped separately across all disk drives in the logical drive. RAID 6 logical drives 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 logical drives). RAID 6 logical drives must be built from four or more disk drives, to a maximum of sixteen. Maximum stripe size depends on the number of disk drives in the logical drive. Disk Drive 1 250 GB Drive Segment Size (Smallest Disk Drive) Disk Drive 2 250 GB Disk Drive 1 1 P1 ... P2 Disk Drive 3 400 GB Disk Drive 4 400 GB Disk Drives in Logical Drive Disk Drive 2 2 P2 ... 449 Disk Drive 3 P1 3 ... P1 Not Used Unused Space: 150 GB Disk Drive 4 P2 4 ... 500 Not Used Unused Space: 150 GB RAID 6 Logical Drive = 500 GB plus Parity (P1 & P2)
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