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Contents
iii
Table of Contents
1 Overview ...............................................................1
Single Ended and Differential SCSI Buses ..............................2
Maximum Cable Length for SCSI Standards ...........................2
Documentation .........................................................................3
ADAC Ultra2 S466 Block Diagram.........................................4
2 Introduction to RAID ............................................5
RAID Benefits..........................................................................5
In This Chapter.........................................................................6
ADAC Ultra2 S466 – 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...................................................................16
Logical Drive States...............................................................16
Disk Array Types ...................................................................17
Enclosure Management ..........................................................17
3 RAID Levels ........................................................19
Selecting a RAID Level .........................................................20
RAID 0...................................................................................21
RAID 1...................................................................................22
RAID 3...................................................................................23
RAID 5...................................................................................25
RAID 10.................................................................................26
RAID 30.................................................................................27
RAID 50.................................................................................28
4 ADAC Ultra2 S466 Features ..............................29
Hardware Requirements.........................................................30
Configuration Features...........................................................30
Hardware Architecture Features.............................................31
Array Performance Features...................................................31
RAID Management Features..................................................32
Fault Tolerance Features........................................................32