Mylex DAC960PG Guia de Instalação descarregar pdf (Página 39)

Functional Description

Manual No. 771971 2-15

Striping with Parity (RAID 3 and RAID 5)

Striping with parity (rotated XOR redundancy) is a method of providing

complete data redundancy that requires only a fraction of the storage

capacity than mirroring for storing redundant information.

In a system configured under RAID 3 or RAID 5 (which requires at least

three SCSI drives), all data and parity blocks are divided between the drives

in such a way that if any single drive is removed (or fails), the data on the

missing drive can be regenerated using the data on the remaining drives

(XOR refers to the Boolean “Exclusive-OR” operator).

Figure 2-9. Drive Group Mapped for Block Striping with Parity

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 105 106

PCI RAID Controller 1
Installation Guide 1
DAC960PG 3
PCI to Ultra-SCSI 3
RAID Controller 3
Class B Compliance 5
Declaration of Conformity 6
Community of Europe 7
About This Manual 8
Conventions 9
Contents 11
Installation 12
Start-up Sequences 12
Enclosure Management 13
Introduction 15
Caution 16
Manual No. 771971 1-3 17
Standard Package Contents 18
Key Features 19
Automatic RAID Functions 20
Enhance SCSI Performance 21
Increase System Availability 21
Operating System Support 21
DAC960PG Specifications 22
Functional Description 25
WARNING 26
PCI Bus Interface 27
Ultra-SCSI Bus Interface 28
Manual No. 771971 2-5 29
SCSI Functions 30
Manual No. 771971 2-7 31
Drive Organization 32
Configuration on Disk 33
Device Translation Table 34
Manual No. 771971 2-11 35
RAID Management 36
RAID Techniques and Terms 37
Striping (RAID 0) 38
Manual No. 771971 2-15 39
Striping Terminology 41
Drive Management 42
Write-Only (WOL) 43
Ready (RDY) 43
Critical 44
Off-line 44
Hot-Swap Drive Replacement 45
Disk Failure Detection 45
Disk Media Error Management 45
Checking Disk Consistency 46
Cache Management 47
Before You Begin . . 50
Installation Notes: 51
Format Drive 54
Connectors and Jumpers 55
External LED Connector 56
SCSI Termination 57
Configuring the SCSI Devices 61
SCSI Cabling 62
Cable Lengths 63
Connecting Non-Disk Devices 64
Using a UPS 65
Cache Battery Backup Option 66
Setting BIOS Options 68
Figure 4-1. BIOS options Menu 69
Press the 70
BIOS Enable or Disable 71
CD-ROM Boot Disable or Enable 71
Error Messages 72
Drive Check Error Messages 73
X system drives installed 74
Aborted Installation 75
System Reboot or Power Down 75
Appendix B 79
IBBU Specifications 80
Battery and Charge Circuit 82
Operation 85
Battery Backup Capacity 86
Recycling the Battery 88
Manual No. 771971 B-11 89
Drive Groups (or Drive Packs) 92
Logical Drive States 93
Logical Drives 94
Mirroring 94
Manual No. 771971 Glossary-5 95
Replacement Table 96
Rotated XOR Redundancy 96
SCSI Drive 96
SCSI Drive States 96
Segment Size 97
Standard Disk Drive 98
Stripe Size 99
Stripe Order 99
Stripe Width 100
Striping 100
System Drives 100
Target ID 100
Write Back Cache 101
Write Through Cache 101
Glossary 102
Manual No. 771971 Index-1 103

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Mylex DAC960PG Guia de Instalação Página 39

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