LSI MegaRAID SCSI 320-2 RAID Controller Series 518 - Manual (Page 44)

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 initiator takes one ID per channel. This leaves 15 IDs
available for 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