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Preface
iii
Table of Contents
1 Overview .................................................. 1
Single Ended and Differential SCSI Buses.......................2
Maximum Cable Length for SCSI Standards....................2
Documentation..................................................................3
MegaRAID Express 500 Block Diagram..........................4
2 Introduction to RAID................................ 5
RAID Benefits..................................................................5
In This Chapter.................................................................6
MegaRAID Express 500 – Host-Based RAID Solution ...7
RAID Overview................................................................8
Fault Tolerance.................................................................8
Consistency Check............................................................8
Disk Rebuild.....................................................................9
Hot Spares ......................................................................10
Hot Swap ........................................................................10
Parity ..............................................................................11
Disk Striping...................................................................12
Disk Mirroring................................................................13
Disk Spanning.................................................................14
Logical Drive..................................................................15
Logical Drive States .......................................................15
SCSI Drive States...........................................................15
Disk Array Types............................................................16
Enclosure Management...................................................16
3 RAID Levels............................................ 17
Selecting a RAID Level..................................................18
RAID 0 ...........................................................................19
RAID 1 ...........................................................................20
RAID 3 ...........................................................................21
RAID 5 ...........................................................................23
RAID 10 .........................................................................24
RAID 30 .........................................................................25
RAID 50 .........................................................................26