Raid 6 Logical Drives; Raid 60 Logical Drives - Adaptec ICP5045BL User Manual

RAID 6 Logical Drives

A RAID 6 logical drive—also referred to as dual drive failure protection—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 at least four disk drives. Maximum stripe size
depends on the number of disk drives in the logical drive.
Disk Drive 1
Disk Drive 2
Disk Drive 3
Disk Drive 4
Disk Drives in Logical Drive

RAID 60 Logical Drives

Similar to a RAID 50 logical drive (see
dual drive failure protection— is built from at least eight disk drives configured as two or more
RAID 6 logical drives, and stripes stored data and two sets of parity data across all disk drives in
both RAID 6 logical drives.
Two sets of parity data provide enhanced data protection, and striping improves performance.
RAID 60 logical drives also provide high data transfer speeds.
Appendix B: Selecting the Best RAID Level
Drive Segment Size (Smallest Disk Drive)
250 GB
250 GB
Disk Drive 1
Disk Drive 2
400 GB
Disk Drive 3
Disk Drive 4
400 GB
page 146), a RAID 60 logical drive—also referred to as
1 P1 ... P2
2 P2 ... 449
P1 3 ... P1
Unused Space = 150 GB
P2 4 ... 500
Unused Space = 150 GB
RAID 6
= 500 GB plus Parity (P1 & P2)
Logical Drive
147
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