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Chapter 2 Introduction to RAID

Logical Drive

A logical drive is a partition in a physical array of disks

that is made up of contiguous data segments on the

physical disks. A logical drive can consist of any of the

following:

• an entire physical array,

• more than one entire physical array,

• a part of an array,

• parts of more than one array, or

• a combination of any two of the above conditions.

Hot Swap

A hot swap is the manual replacement of a defective

physical disk unit while the computer is still running. When

a new drive has been installed, you must issue a command

to rebuild the drive.

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ADAC Ultra2 S466 1
Single Ended and Low 1
Voltage Differential SCSI 1
PCI RAID Controller 1
Hardware Guide 1
Revision History 2
Table of Contents 3
Contents 5
Preface vii 7
# of Physical 9
Physical Device Layout 10
Preface, Continued 12
FCC Regulatory Statement 13
Disclaimer 14
1 Overview 15
• a single ended bus and 16
Documentation 17
2 Introduction to RAID 19
In This Chapter 20
RAID Overview 22
Consistency Check 22
Fault Tolerance 22
Disk Striping 23
Disk Spanning 24
Disk Mirroring 25
Hot Spares 27
Disk Rebuild 28
Logical Drive 29
Hot Swap 29
SCSI Drive States 30
Logical Drive States 30
Disk Array Types 31
Enclosure Management 31
3 RAID Levels 33
Selecting a RAID Level 34
Chapter 3 RAID Levels 35
RAID 3, Continued 38
4 ADAC Ultra2 S466 Features 43
Hardware Requirements 44
Configuration Features 44
Array Performance Features 45
RAID Management Features 46
Fault Tolerance Features 46
Software Utilities 47
PCI Bridge/CPU 49
Cache Memory 49
ADAC Ultra2 S466 BIOS 49
Onboard Speaker 50
Serial Port 50
SCSI Bus 50
SCSI Connectors 51
SCSI Termination 51
SCSI Firmware 51
RAID Management 52
Fault-Tolerance Features 53
Compatibility 54
5 Configuring ADAC Ultra2 55
Current Configuration 56
Logical Drive Configuration 56
Configuring Arrays 59
Configuration Strategies 60
Assigning RAID Levels 62
Configuring Logical Drives 62
Optimizing Data Storage 63
Array Configuration Planner 65
6 Hardware Installation 67
Installation Steps 68
Step 1 Unpack 69
Step 2 Power Down 69
Step 3 Configure Motherboard 69
Step 4 Install Cache Memory 70
Step 5 Set Jumpers 72
ADAC Ultra2 S466 Card Layout 72
Step 5 Set Jumpers, Continued 73
Step 6 Set Termination 75
SCSI Termination, Continued 77
Step 8 Connect SCSI Cables 80
Step 9 Set Target IDs 81
Step 10 Power Up 83
Step 11 Run ADAC BIOS Setup 84
DEVICE=C:\ADACDROM.SYS 85
MSCDEX /D:MSCD001 85
7 Troubleshooting 87
Firmware Initializing 88
BIOS Boot Error Messages 89
Other BIOS Error Messages 91
Other Potential Problems 93
Chapter 7 Troubleshooting 95
A SCSI Cables and 97
Connectors 97
AMP - 786090-7 98
68 Conductor 0.025 Centerline 98
Continued 100
B Audible Warnings 107

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