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3-8 RAID Levels
Copyright © 2002 by LSI Logic Corporation. All rights reserved.
RAID 50 can sustain one to four drive failures while maintaining data
integrity, if each failed disk is in a different RAID 5 array.
Figure 3.5 shows a RAID 50 array with six disk drives.
Figure 3.5 RAID 50 Array
Uses Works best when used with data that requires high reliability,
high request rates, high data transfer, and medium to large
capacity.
Strong Points Provides high data throughput, data redundancy, and very
good performance.
Weak Points Requires 2 to 4 times as many parity drives as RAID 5.
Drives 6 to 30
The MegaRAID SCSI 320-0 controller supports one or two
SCSI channels, with up to 15 SCSI devices on each channel.
Segment 1
Segment 6
Parity (9-10)
Disk 1 Disk 2 Disk 3
Disk 4 Disk 5 Disk 6
Data Flow
RAID 5
RAID 5
Segment 2
Parity (5-6)
Segment 9
Parity (1-2)
Segment 5
Segment 10
Segment 3
Segment 8
Parity (11-12)
Segment 4
Parity (7-8)
Segment 11
Parity (3-4)
Segment 7
Segment 12
RAID 0
MegaRAID Controller