Compaq HSZ80 Manuale di Servizio Pagina 142
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3–52 Creating Storagesets
Increasing the Request Rate
A large chunk size (relative to the average request size) increases the request rate by
allowing multiple disk drives to respond to multiple requests. If one disk drive
contains all of the data for one request, then the other disk drives in the storageset are
available to handle other requests. Thus, in principle, separate I/O requests can be
handled in parallel, thereby increasing the request rate. This concept is shown in
Figure 3–15.
Figure 3–15. Chunk Size Larger than the Request Size
Applications such as interactive transaction processing, office automation, and file
services for general timesharing tend to require high I/O request rates.
CXO-5135A-MC
Chunk size = 128k (256 blocks)
Request A
Request B
Request C
Request D
- First Edition (December 1998) 1
- Compaq Computer Corporation 1
- Chapter 1 5
- Chapter 2 5
- Chapter 3 6
- Chapter 4 6
- Chapter 5 7
- Appendix A 9
- Appendix B 9
- About This Guide 15
- Precautions 16
- VHDCI Cable Precautions 17
- Maintenance Port Precautions 17
- Conventions 18
- Special Notices 19
- Required Tools 20
- Related Publications 21
- Revision History 22
- General Description 23
- Typical Installation 24
- CXO6742A 25
- 1–4 General Description 26
- Summary of HSZ80 Features 27
- 1–6 General Description 28
- The HSZ80 Array Controller 29
- 1–8 General Description 30
- CXO6284B 31
- 1–10 General Description 32
- Ferrite bead 33
- Terminator 33
- Jumper cable 33
- Maintenance port cable 33
- Item Description 33
- 1–12 General Description 34
- Operator Control Panel 35
- Maintenance Port 36
- Utilities and Exercisers 37
- Disk Inline Exerciser 38
- Configuration Utility 38
- Clone Utility 38
- Field Replacement Utility 39
- Device Statistics Utility 39
- Cache Module 40
- CXO6306B 41
- Caching Techniques 42
- Write-Through Caching 43
- Write-Back Caching 43
- Nonvolatile Memory 44
- 1–24 General Description 46
- 1–26 General Description 48
- 1–28 General Description 50
- External Cache Battery 51
- Table 1–11 Location of Parts 52
- Charging Diagnostics 53
- Chapter 2 55
- A Few Tips 57
- CXO6285B 59
- Maintenance and Service Guide 60
- ID, MODE 61
- RUN FRUTIL 68
- Optional Steps 76
- UPS Support 78
- CXO5806B 79
- 1 2 3 4 5 6 81
- Other controller 82
- This controller 82
- Selecting a Failover Mode 83
- Selecting a Cache Mode 85
- Fault-Tolerance 86
- Host SCSI Bus 87
- Device SCSI Bus 88
- Using Preferred ID Numbers 89
- Creating Storagesets 91
- Disk drives 93
- 3–4 Creating Storagesets 94
- 3–6 Creating Storagesets 96
- Choosing a Storageset Type 98
- CXO5507A 99
- 3–10 Creating Storagesets 100
- CXO6235A 101
- 3–12 Creating Storagesets 102
- Mirror drives contain 103
- 3–14 Creating Storagesets 104
- Availability 105
- 3–16 Creating Storagesets 106
- Performance and Availability 108
- Cloning Data for Backup 110
- CXO5510A 111
- 3–22 Creating Storagesets 112
- 3–24 Creating Storagesets 114
- INITIALIZE DISKnnnn 115
- SAVE_CONFIGURATION 115
- 3–26 Creating Storagesets 116
- Controller: 117
- Host port_1: 117
- Host port_2: 117
- 3–28 Creating Storagesets 118
- NOTRANSPORTABLE 119
- LOCAL 119
- Size: 4108970 blocks 119
- Node IDs 120
- Storagesets 122
- D401 Disk 4 1 123
- D1207 Disk 12 7 123
- D5 Disk 0 5 123
- Creating a Storageset Map 124
- To create a storageset map: 125
- Controller 126
- 3–38 Creating Storagesets 128
- CXO6186A 129
- Planning Partitions 130
- Disk Drives 131
- Enabling Switches 132
- Changing Switches 132
- RAIDset Switches 133
- Membership 134
- Mirrorset Switches 135
- Copy Speed 136
- Read Source 136
- Disaster Tolerance Support 137
- Device Switches 138
- Device Transfer Rate 139
- Local/Remote 140
- Initialize Switches 141
- Increasing the Request Rate 142
- CXO-5172A-MC 143
- 3–54 Creating Storagesets 144
- Save Configuration 145
- Controller Configurations 146
- Destroy/Nodestroy 147
- Unit Switches 148
- Configuring Storagesets 149
- Introduction 150
- Configuring a Stripeset 151
- Configuring a Mirrorset 152
- Configuring a RAIDset 154
- 4–8 Configuring Storagesets 156
- 4–10 Configuring Storagesets 158
- SHOW storageset-name 159
- 4–12 Configuring Storagesets 160
- 4–14 Configuring Storagesets 162
- Enabling Autospare 163
- Deleting a Storageset 164
- Changing Device Switches 165
- Changing Initialize Switches 166
- Changing Unit Switches 166
- Finding the CCL Location 168
- Troubleshooting with the CCL 169
- SCSI-2 Mode 170
- SCSI-3 Mode 170
- Host Modes 171
- 4–24 Configuring Storagesets 172
- HSZ80 Array Controller ACS 173
- Version 8.3 Release Notes 173
- Transparent Failover Mode 174
- SET THIS PORT_1_ID = (1,2) 175
- SET THIS PORT_2_ID = (3,4) 175
- 4–28 Configuring Storagesets 176
- CXO6479A 177
- 4–30 Configuring Storagesets 178
- SET THIS PORT_1_ID = 1 179
- SET THIS PORT_2_ID = 2 179
- Multiple-Bus Failover Mode 180
- 4–34 Configuring Storagesets 182
- Moving Storagesets 183
- 4–36 Configuring Storagesets 184
- Name Storageset Uses Used by 185
- 4–38 Configuring Storagesets 186
- CLI Commands 187
- CLI Overview 188
- Getting Help 189
- Entering CLI Commands 189
- Unit Naming 190
- Changing the CLI Prompt 192
- Command Syntax 192
- ADD DISK 193
- Switches 194
- Examples 195
- See also 196
- ADD MIRRORSET 197
- 5–12 CLI Commands 198
- ADD PASSTHROUGH 202
- ADD RAIDSET 205
- ADD SPARESET 209
- ADD STRIPESET 210
- ADD UNIT 213
- 5–30 CLI Commands 216
- 5–32 CLI Commands 218
- CLEAR_ERRORS CLI 221
- CLEAR_ERRORS 222
- INVALID_CACHE 222
- UNKNOWN 224
- LOST_DATA 226
- UNWRITEABLE_DATA 228
- CONFIGURATION RESET 230
- CONFIGURATION RESTORE 231
- CONFIGURATION SAVE 233
- CREATE_PARTITION 234
- DELETE FAILEDSET 239
- DELETE SPARESET 240
- Parameter 241
- DESTROY_PARTITION 243
- DIRECTORY 245
- 5–60 CLI Commands 246
- Your options are: 247
- INITIALIZE 248
- Parameters 249
- 5–64 CLI Commands 250
- 5–66 CLI Commands 252
- 5–68 CLI Commands 254
- 5–72 CLI Commands 258
- POWEROFF 260
- 5–76 CLI Commands 262
- ■ No spare disks exist 263
- 5–82 CLI Commands 268
- RESTART 269
- RETRY_ERRORS 271
- SELFTEST 275
- Table 5–5 SET 278
- Switches (Continued) 278
- 5–94 CLI Commands 280
- 5–96 CLI Commands 282
- 5–98 CLI Commands 284
- 5–100 CLI Commands 286
- 5–106 CLI Commands 292
- SET FAILEDSET 294
- SET FAILOVER 296
- 5–114 CLI Commands 300
- SET MULTIBUS_FAILOVER 304
- SET NOFAILOVER 306
- SET NOMULTIBUS_FAILOVER 308
- RAIDset-name 310
- DT_SUPPORT 315
- 5–130 CLI Commands 316
- 5–132 CLI Commands 318
- 5–134 CLI Commands 320
- 5–140 CLI Commands 326
- SHOW THIS_CONTROLLER FULL 327
- 5–142 CLI Commands 328
- SHUTDOWN 329
- UNMIRROR 331
- System Profiles 333
- Device Profile 334
- Storageset Profile 335
- Enclosure Template 336
- Controller Specifications 337
- Environmental Specifications 339
- B–4 Controller Specifications 340
- Glossary 341
- GL–2 Glossary 342
- GL–4 Glossary 344
- GL–6 Glossary 346
- GL–8 Glossary 348
- GL–10 Glossary 350
- GL–12 Glossary 352
- GL–14 Glossary 354
- GL–16 Glossary 356
- GL–18 Glossary 358
- Index 362
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