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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 Set............................................................3
2 Introduction to RAID................................ 5
RAID Overview................................................................5
RAID Levels.....................................................................6
Consistency Check............................................................6
Fault Tolerance .................................................................6
Disk Striping.....................................................................7
Disk Mirroring..................................................................8
Disk Spanning...................................................................9
Parity...............................................................................10
Hot Spares.......................................................................11
Disk Rebuild ...................................................................12
Logical Drive..................................................................13
Hot Swap ........................................................................13
SCSI Drive States ...........................................................13
Logical Drive States........................................................13
Disk Array Types............................................................14
Enclosure Management...................................................14
3 RAID Levels ............................................ 15
Selecting a RAID Level ..................................................16
RAID 0 ...........................................................................17
RAID 1 ...........................................................................18
RAID 3 ...........................................................................19
RAID 5 ...........................................................................21
RAID 10 .........................................................................22
RAID 30 .........................................................................23
RAID 50 .........................................................................24
4 Features..................................................25
SMART Technology.......................................................25
Configuration on Disk.....................................................26
Hardware Requirements..................................................26
Configuration Features....................................................26
Hardware Architecture Features .....................................27
Array Performance Features ...........................................27
RAID Management Features...........................................28
Fault Tolerance Features.................................................28
Software Utilities ............................................................28
Operating System Software Drivers................................29
MegaRAID Specifications..............................................29
Components ....................................................................30
Summary.........................................................................32