LSI2108/2208SASMegaRAIDCongurationUtilityUser'sManual
1-6
RAID 50
RAID 50 is a combination of RAID 5 and RAID 0. This type of drive group is called
a spanned drive group because data is striped across multiple RAID 5 drive groups.
RAID 50 requires at least 6 drives. The following illustration provides a visual ex-
ample of a RAID 50 virtual drive group.
Segment 1
Segment 6
Parity (9, 10)
Segment 2
Parity (5,6)
Segment 9
Drive A
Drive B
Parity (1,2)
Segment 5
Segment 10
Drive C
RAID 5
Segment 3
Segment 8
Parity (11, 12)
Segment 4
Parity (7,8)
Segment 11
Drive D
Drive E
Parity (3,4)
Segment 7
Segment 12
Drive F
RAID 5
RAID 0
RAID 50
RAID 6
Similar to RAID 5, RAID 6 also provides block-level striping with parity data distrib-
uted across all drives, except that there are two parity blocks per stripe instead of
just one. A RAID 6 conguration can survive the loss of any two drives in a virtual
drive without losing data and requires a minimm of 3 drives. The following illustra-
tion provides a visual example of a RAID 6 virtual drive group.
Note: In the following RAID 6 illustration, the P drives represent the RAID
5 parity scheme. The Q drives represent the second set of parity drives.
Segment 1 Segment 2
Drive A
Drive B
Segment 3 Segment 4 Parity (P1-P4)
Drive C
Drive D
Drive E
Parity (Q1-Q4)
Segment 6 Segment 7 Segment 8 Party (P5-P8) Parity (Q5-Q8) Segment 5
Segment 11 Segment 12 Parity (P9-P12) Party (Q9-Q12) Segment 9 Segment 10
Segment 16 Parity (P13-P16) Parity (Q13-Q16) Segment 13 Segment 14 Segment 15
Parity (P17-P20) Parity (Q17-Q20) Segment 17 Segment 18 Segment 19 Segment 20
Drive F
RAID 50 Example
RAID 6 Example
