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│
┌───────┴───────┐
│ Disk │
│ Controller │
└───────┬───────┘
│
│
┌─────────────┬────────────┼────────────┬────────────┐
│ │ │ │ │
┌────┴─────┐ ┌────┴─────┐ ┌────┴─────┐ ┌────┴─────┐ ┌────┴─────┐
│ xxxxx │ │ xxxxx │ │ xxxxx │ │ xxxxx │ │ Parity │ Block 0
├──────────┤ ├──────────┤ ├──────────┤ ├──────────┤ ├──────────┤
│ yyyyy │ │ yyyyy │ │ yyyyy │ │ yyyyy │ │ Parity │
├──────────┤ ├──────────┤ ├──────────┤ ├──────────┤ ├──────────┤
│ │ │ │ │ │ │ │ │ │ Block n
└──────────┘ └──────────┘ └──────────┘ └──────────┘ └──────────┘
Disk 1 Disk 2 Disk 3 Disk 4 Disk 5
xxxxx and yyyyy = Blocks belonging to long files
Figure 18. RAID-4 (Block Interleave Data Striping with One Parity Disk)
1.6.6.7 RAID-5 - Block Interleave Data Striping with Skewed Parity
The RAID-5 design tries to overcome all of these problems. Data is striped
across the disks to ensure maximum read performance when accessing large
files, and having the data striped in blocks improves the array′s performance in
a transaction processing environment. Parity information is stored on the array
to guard against data loss. Skewing is used to remove the bottleneck that is
created by storing all the parity information on a single drive.
│
┌───────┴───────┐
│ Disk │
│ Controller │
└───────┬───────┘
│
│
┌─────────────┬────────────┼────────────┬────────────┐
│ │ │ │ │
┌────┴─────┐ ┌────┴─────┐ ┌────┴─────┐ ┌────┴─────┐ ┌────┴─────┐
│ xxxxx │ │ xxxxx │ │ xxxxx │ │ xxxxx │ │ Parity │ Block 0
├──────────┤ ├──────────┤ ├──────────┤ ├──────────┤ ├──────────┤
│ xxxxx │ │ xxxxx │ │ xxxxx │ │ Parity │ │ xxxxx │
├──────────┤ ├──────────┤ ├──────────┤ ├──────────┤ ├──────────┤
│ yyyyy │ │ yyyyy │ │ Parity │ │ yyyyy │ │ yyyyy │
├──────────┤ ├──────────┤ ├──────────┤ ├──────────┤ ├──────────┤
│ │ │ │ │ │ │ │ │ │ Block n
└──────────┘ └──────────┘ └──────────┘ └──────────┘ └──────────┘
Disk 1 Disk 2 Disk 3 Disk 4 Disk 5
xxxxx and yyyyy = Blocks belonging to long files
Figure 19. RAID-5 (Block Interleave Data Striping with Skewed Parity)
Chapter 1. IBM PC Server Technologies 29
- Integration Guide 1
- December 1995 1
- First Edition (December 1995) 2
- Abstract 3
- Contents 4
- Special Notices 11
- NetWare Integration Guide 12
- Related Publications 14
- Acknowledgments 15
- 1.1 Processors 16
- 1.1.1 Clock Rate 16
- 1.1.2 External Interfaces 17
- 1.1.3 Processor Types 17
- 1.2 Multiprocessing 18
- 1.3 Memory 18
- 1.3.1 Caches 19
- 1.3.1.1 SMP Caching 20
- 1.3.2 Memory Interleaving 21
- 1.3.3 Dual Path Buses 22
- 10 NetWare Integration Guide 25
- 1.5 Bus Architectures 27
- 1.4.5 Performance Impact 27
- 1.5.1 ISA Bus 28
- 1.5.2 EISA Bus 28
- 1.5.3 Micro Channel Bus 28
- 14 NetWare Integration Guide 29
- 1.5.4 PCI Bus 30
- 1.6 Disk Subsystem 31
- 1.6.1 Hard Disk Interfaces 31
- 1.6.2 SCSI Technology 32
- 18 NetWare Integration Guide 33
- 1.6.3 SCSI Adapters 34
- 20 NetWare Integration Guide 35
- 1.6.4 Hard Disk Drives 36
- 1.6.5 RAID Technology 37
- 1.6.6 RAID Classifications 38
- Number of Disks in the array 39
- 24 NetWare Integration Guide 39
- 30 NetWare Integration Guide 45
- 1.6.7 Recommendations 46
- 1.7 LAN Subsystem 46
- 1.7.1 Shared RAM Adapters 46
- 1.7.2 Bus Master Adapters 47
- 1.7.3 PeerMaster Technology 48
- 1.8 Security Features 49
- 1.8.1 Tamper-Evident Cover 50
- 1.8.2 Secure I/O Cables 50
- 1.8.3 Passwords 50
- 1.8.4 Secure Removable Media 51
- 1.8.6 Unattended Start Mode 52
- 1.9 Systems Management 52
- 1.9.1 DMI 52
- 38 NetWare Integration Guide 53
- 1.9.2 SNMP 54
- 1.9.2.2 SNMP Agent 55
- 1.9.2.3 SNMP Manager 55
- 1.9.2.4 Traps 55
- 1.9.3 NetFinity 56
- 42 NetWare Integration Guide 57
- 1.9.3.2 NetFinity Manager 58
- 44 NetWare Integration Guide 59
- 1.9.4 SystemView 60
- 46 NetWare Integration Guide 61
- 1.10 Fault Tolerance 62
- 1.10.1 NetWare SFT III 63
- Mirrored Server Link (MSL): 64
- 50 NetWare Integration Guide 65
- 52 NetWare Integration Guide 67
- 1.11.1 APC PowerChute 68
- 54 NetWare Integration Guide 69
- Copyright IBM Corp. 1995 55 70
- 2.1.1 IBM PC Server 300 71
- 2.1.2 IBM PC Server 310 72
- 2.1.3 IBM PC Server 320 EISA 73
- 2.1.4 IBM PC Server 320 MCA 74
- 2.1.5 IBM PC Server 500 75
- 2.1.6 IBM PC Server 520 EISA 76
- 2.1.7 IBM PC Server 520 MCA 77
- 2.1.8 IBM PC Server 720 78
- Copyright IBM Corp. 1995 65 79
- 3.1 The Setup Program 81
- 3.1.1 Main Menu 81
- 3.1.2 Advanced Menu 82
- 0632 Diskette Drive Error 83
- 70 NetWare Integration Guide 84
- 3.1.3 Security 85
- Incorrect password 86
- System disabled 86
- 72 NetWare Integration Guide 86
- _Txx.BIN for DX2-66 models 87
- _Txx.BIN for Pentium models 87
- 74 NetWare Integration Guide 88
- 76 NetWare Integration Guide 90
- 78 NetWare Integration Guide 92
- SCSI Parity Checking: 93
- 80 NetWare Integration Guide 94
- Include in BIOS SCAN 95
- 3.4 System Programs 96
- 3.4.3 Main Menu Options 98
- 3.4.5 Set Configuration Menu 100
- 88 NetWare Integration Guide 102
- 90 NetWare Integration Guide 104
- 3.4.6 Set Features Menu 105
- 92 NetWare Integration Guide 106
- Enter password 107
- 94 NetWare Integration Guide 108
- 96 NetWare Integration Guide 110
- 3.4.7 Test the Computer 111
- 3.4.8 More Utilities Menu 112
- Run System Checkout: 114
- 3.5 RAID Controller Utility 115
- 3.5.1 Drive Information 117
- 3.5.2 Formatting the Disks 118
- Stripe Unit size: 120
- Rebuild Priority: 120
- Parity placement: 120
- Read-Ahead: 120
- 3.5.4 Creating a Disk Array 122
- 3.5.5 Defining Logical Drives 123
- 3.5.7 Initializing the Array 126
- 4.1 ServerGuide Overview 128
- 4.2 Starting ServerGuide 128
- Start Here: 130
- Software Installation: 130
- NetFinity Overview: 130
- Utility Programs: 130
- Performance Tuning: 130
- Online Documentation: 131
- Figure 71. Installing NetWare 132
- ServerGuide 136
- 4.4.1 Hardware Requirements 140
- 4.4.2 Software Requirements 140
- 4.4.4 Installation Files 140
- 4.4.5 Installation Procedure 141
- LOAD C:SERVER.312IBMRAID 143
- Figure 86. Volume Status 145
- TOKEN, and then press Enter 146
- BIND IPX TO TOKEN 146
- DOWN at the colon prompt 147
- 4.5.1 Hardware Requirements 148
- 4.5.2 Software Requirements 148
- 4.5.3 Installation Procedure 148
- Figure 91. Installation Menu 149
- Figure 94. Create Partition 151
- case-sensitive 154
- 4.6.1 System Requirements 157
- 4.6.2.3 Starting NetFinity 163
- 4.7.1 Installing the Utility 164
- Figure 136 177
- Chapter 5. Performance Tuning 179
- latency 180
- 5.2.1 DatagLANce 184
- 5.2.2.1 MONITOR.NLM 185
- 5.2.2.2 Set Command 186
- 5.3 Tuning NetWare 187
- 5.3.1 Disk Subsystem 188
- 5.3.1.3 Turbo Fat Indexing 189
- 5.3.1.4 Directory Caching 190
- 5.3.1.5 File Caching 191
- Recommendation: 192
- NetWare 3.12: 192
- NetWare 4.1: 192
- 5.3.1.9 Multiple Volumes 193
- 5.3.2 Network Subsystem 194
- 5.3.2.2 Packet Size 195
- Recommendation 196
- 5.3.3 System Memory 197
- Memory Fragmentation: 198
- 5.3.4 Memory Requirements 199
- 5.3.5 System Processor 199
- LOAD MONITOR -P 200
- Patch Information 210
- ∼ towfiq/lan-drivers.html 212
- MSCDEX.EXE 214
- List of Abbreviations 215
- Index 209 218
- Index 211 220
- BUSINESS REPLY MAIL 223
- SG24-4576-00 224
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