LSI Series 520 사용자 설명서

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