American Megatrends MegaRAID Express 500 User Manual
Page 3
Preface
iii
Table of Contents
Overview................................................... 1
Single Ended and Differential SCSI Buses .......................2
Maximum Cable Length for SCSI Standards ....................2
Documentation ..................................................................3
MegaRAID Express 500 Block Diagram ..........................4
Introduction to RAID ................................ 5
RAID Benefits...................................................................5
In This Chapter..................................................................6
MegaRAID Express 500 – Host-Based RAID Solution....7
RAID Overview ................................................................8
Consistency Check ............................................................8
Fault Tolerance .................................................................8
Disk Striping .....................................................................9
Disk Spanning .................................................................10
Disk Mirroring ................................................................11
Parity ...............................................................................12
Hot Spares.......................................................................13
Disk Rebuild ...................................................................14
Logical Drive ..................................................................15
Hot Swap.........................................................................15
SCSI Drive States............................................................15
Logical Drive States ........................................................15
Disk Array Types ............................................................16
Enclosure Management ...................................................16
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