LSI MegaRAID SCSI 320-2 RAID Controller Series 518 Hardware Manual page 44

Figure 3.5 RAID 50 Array
RAID 5
Disk 1
Segment 1 Segment 2
Segment 6 Parity (5-6)
Parity (9-10) Segment 9
3-8
RAID 50 can sustain one to four drive failures while maintaining data
integrity, if each failed disk is in a different RAID 5 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.
Figure 3.5 shows a RAID 50 array with six disk drives.
MegaRAID Controller
Disk 2 Disk 3
Parity (1-2)
Segment 5
Segment 10
RAID Levels
Copyright © 2002 by LSI Logic Corporation. All rights reserved.
Data Flow
Disk 4
Segment 3 Segment 4
Segment 8 Parity (7-8)
Parity (11-12) Segment 11
RAID 0
RAID 5
Disk 5 Disk 6
Parity (3-4)
Segment 7
Segment 12