LSI MegaRAID SCSI 320-1 RAID Controller Series 520 Manuel d'utilisateur Page 27
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RAID Overview 2-3
Copyright © 2002 by LSI Logic Corporation. All rights reserved.
2.2.2 SCSI-to-SCSI External RAID
A SCSI-to-SCSI external RAID product puts the RAID intelligence inside
the RAID chassis and uses a plain SCSI host adapter installed in the
network server. The data transfer rate is limited to the bandwidth of the
SCSI channel. A SCSI-to-SCSI external RAID product that has two Wide
SCSI channels operating at speeds up to 320 Mbytes/s must squeeze
the data into a single Wide SCSI (320 Mbytes/s) channel back to the host
computer.
In SCSI-to-SCSI external RAID products, the disk drive subsystem uses
only a single SCSI ID, which allows you to connect multiple drive
subsystems to a single SCSI controller.
2.3 RAID Overview
RAID is a collection of specifications that describes a system for ensuring
the reliability and stability of data stored on large disk subsystems. A
RAID system can be implemented in a number of different versions (or
RAID levels). MegaRAID SCSI 320-1 supports standard RAID levels 0,
1, and 5, and RAID levels 10 and 50, special RAID versions supported
by MegaRAID SCSI 320-1.
2.3.1 Physical Array
A RAID array is a collection of physical disk drives governed by the RAID
management software. A RAID array appears to the host computer as
one or more logical drives.
2.3.2 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
- MegaRAID 1
- SCSI 320-1 1
- RAID Controller 1
- HARDWARE 1
- FCC Regulatory Statement 3
- Logical Drive Configuration 7
- Physical Device Layout 9
- Contents 13
- Contents xv 15
- Chapter 1 19
- Overview 19
- 1.1 Features 20
- 1.2 SCSI Channel 20
- 1.3 NVRAM and Flash ROM 20
- 1.4 SCSI Connectors 20
- · Single-ended bus 21
- 1.8 Documentation 22
- Documentation 1-5 23
- 1-6 Overview 24
- Chapter 2 25
- Introduction to RAID 25
- 2.1.2 Increased Reliability 26
- 2.2.1 Host-Based RAID 26
- 2.3 RAID Overview 27
- 2.3.3 Consistency Check 28
- 2.3.4 Fault Tolerance 28
- 2.3.5 Disk Striping 28
- RAID Overview 2-5 29
- MegaRAID Controller 29
- 2.3.6 Disk Mirroring 30
- 2.3.7 Disk Spanning 31
- 2.3.8 Parity 32
- 2.3.9 Hot Spares 32
- 2.3.10 Hot Swapping 33
- 2.3.11 Disk Rebuild 33
- 2.3.12 Logical Drive States 34
- 2.3.13 SCSI Drive States 34
- 2.3.14 Disk Array Types 35
- 2.3.15 Enclosure Management 35
- 2-12 Introduction to RAID 36
- Chapter 3 37
- RAID Levels 37
- 3.2 RAID 0 38
- 3.3 RAID 1 39
- 3.4 RAID 5 40
- Figure 3.3 RAID 5 Array 41
- 3.5 RAID 10 42
- 3.6 RAID 50 43
- Figure 3.5 RAID 50 Array 44
- Chapter 4 45
- Features 45
- 4.2 Configuration on Disk 46
- 4.3 Configuration Features 46
- 4.5 RAID Management Features 48
- 4.6 Fault Tolerance Features 48
- 4.7 Software Utilities 49
- 4.9.1 PCI Bridge/CPU 51
- 4.9.2 Cache Memory 51
- 4.9.3 MegaRAID BIOS 51
- 4.9.4 Serial Port 52
- 4.9.5 SCSI Bus 52
- 4.9.6 SCSI Connectors 52
- 4.9.7 SCSI Termination 52
- 4.10 RAID Management 53
- 4.11 Compatibility 54
- 4.11.3 Software 55
- 4-12 Features 56
- Chapter 5 57
- Configuring Physical Drives 57
- Arrays, and Logical Drives 57
- 5.1.4 Physical Device Layout 61
- 5.2 Configuring Arrays 64
- 5.3 Creating Logical Drives 65
- 5.3.2 Assigning RAID Levels 67
- 5.4.1 Optimizing Data Storage 68
- Chapter 6 73
- Hardware Installation 73
- 6.2 Installation Steps 74
- 6.2.1 Step 1: Unpack 75
- 6.2.2 Step 2: Power Down 75
- Installation Steps 6-5 77
- Unjumpered Enabled 77
- Jumpered Disabled 77
- 6.2.4 Step 4: Set Termination 78
- Installation Steps 6-7 79
- 6-8 Hardware Installation 80
- Installation Steps 6-9 81
- 6-10 Hardware Installation 82
- · Tape drive set to SCSI ID 2 83
- 6-12 Hardware Installation 84
- Installation Steps 6-13 85
- 6.2.7 Step 7: Set Target IDs 86
- 6.2.8 Step 8: Power Up 88
- · Novell NetWare 5.1, 6.0 89
- · Red Hat Linux 7.2, 7.3 89
- 6.3 Summary 90
- Chapter 7 91
- Troubleshooting 91
- Firmware Initializing 92
- 7.2 BIOS Boot Error Messages 93
- 7.3 Other BIOS Error Messages 94
- 7.4 Other Potential Problems 95
- Appendix A 97
- SCSI Cables and 97
- Connectors 97
- SCSI devices is shown below 99
- Table A.1 SCSI Cable Vendors 102
- Appendix B 107
- Audible Warnings 107
- B-2 Audible Warnings 108
- Glossary 109
- Appendix C 109
- C-2 Glossary 110
- C-4 Glossary 112
- C-6 Glossary 114
- C-8 Glossary 116
- C-10 Glossary 118
- IX-2 Index 120
- Index IX-3 121
- IX-4 Index 122
- Customer Feedback 123
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