Mylex DAC960PG Guía de instalación descargar pdf (Pagina 46)

Drive Management

2-22 DAC960PG Installation Guide

When a disk reports a media error during a write, the controller issues a

REASSIGN command to the disk, and writes the data out to a new location

on the disk.

Checking Disk Consistency

A consistency check is a process that verifies the integrity of redundant data.

For example, performing a consistency check of a mirrored drive assures

that the data on both drives of the mirrored pair are exactly the same. To

verify RAID 3 or RAID 5 redundancy, a consistency check reads all

associated data blocks, computes parity, reads parity, and verifies that the

computed parity matches the read parity.

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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 Guía de instalación Pagina 46

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