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General Description 1–21
Write-Through Caching
When the controller receives a write request from the host, it stores the
data in its cache module, writes the data to the disk drives, then notifies
the host when the write operation is complete. This process is called
write-through caching because the data actually passes through—and is
stored in—the cache memory on its way to the disk drives.
If you enable read caching for a storage unit, write-through caching is
automatically enabled. Likewise, if you disable read caching, write-
through caching is automatically disabled.
Write-Back Caching
This caching technique improves the subsystem’s response time to
write requests by allowing the controller to declare the write operation
“complete” as soon as the data reaches its cache memory. The
controller performs the slower operation of writing the data to the disk
drives at a later time.
By default, write-back caching is enabled for all units. In either case,
the controller will not provide write-back caching to a unit unless the
cache memory is non-volatile, as described in the next section.
Fault-Tolerance for Write-Back Caching
The cache module supports nonvolatile memory and dynamic cache
policies to protect the availability of its unwritten (write-back) data:
Nonvolatile Memory
The controller can provide write-back caching for any storage unit as
long as the controller’s cache memory is nonvolatile. In other words, to
enable write-back caching, you must provide a backup power source to
the cache module to preserve the unwritten cache data in the event of a
power failure. If the cache memory were volatile—that is, if it didn’t
have a backup power supply—the unwritten cache data would be lost
during a power failure.
By default, the controller expects to use an ECB as the backup power
source for its cache module. See “External Cache Battery,” page 1–28,
for more information about the ECB. However, if your subsystem is
backed up by a UPS (uninterruptible power supply), you can tell the
controller to use the UPS as the backup power source with the SET
- User’s Guide 1
- Chapter 4 Troubleshooting 6
- Appendix A System Profiles 8
- Appendix B CLI Commands 8
- Appendix C LED Codes 9
- Glossary 10
- Precautions 18
- Component Precaution 19
- Maintenance Port Precautions 19
- Conventions 20
- Special Notices 21
- Required Tools 22
- Related Publications 23
- Revision History 24
- General Description 25
- 1–2 HSG80 User’s Guide 26
- General Description 1–3 27
- Summary of HSG80 Features 28
- General Description 1–5 29
- 1–6 HSG80 User’s Guide 30
- The HSG80 Array Controller 31
- 1–8 HSG80 User’s Guide 32
- General Description 1–9 33
- 1–10 HSG80 User’s Guide 34
- General Description 1–11 35
- Small diameter 36
- Operator Control Panel 37
- Maintenance Port 38
- Utilities and Exercisers 38
- Virtual Terminal Display 39
- Disk Inline Exerciser 39
- Configuration Utility 39
- Clone Utility 40
- Field Replacement Utility 40
- Device Statistics Utility 41
- Cache Module 42
- General Description 1–19 43
- Caching Techniques 44
- Read Caching 44
- Read-Ahead Caching 44
- Write-Through Caching 45
- Write-Back Caching 45
- Nonvolatile Memory 45
- 1–22 HSG80 User’s Guide 46
- General Description 1–23 47
- 1–24 HSG80 User’s Guide 48
- General Description 1–25 49
- 1–26 HSG80 User’s Guide 50
- General Description 1–27 51
- External Cache Battery 52
- Charging Diagnostics 53
- Battery Hysteresis 53
- 1–30 HSG80 User’s Guide 54
- CHAPTER 2 55
- Introduction 56
- 2–4 HSG80 User’s Guide 58
- SET THIS_CONTROLLER CACHE_UPS 59
- RESTART THIS_CONTROLLER 59
- RESTART OTHER_CONTROLLER 59
- SHOW THIS_CONTROLLER FULL 59
- 2–6 HSG80 User’s Guide 60
- Maintenance 61
- 2–8 HSG80 User’s Guide 62
- Other controller 63
- This controller 63
- Selecting a Failover Mode 64
- Using Multiple-Bus Failover 65
- Selecting a Cache Mode 66
- Fault-Tolerance 66
- Backing up Power with a UPS 67
- 1 2 3 4 5 6 68
- 2–16 HSG80 User’s Guide 70
- 2–18 HSG80 User’s Guide 72
- Optical Support 73
- 2–20 HSG80 User’s Guide 74
- Creating Storagesets 79
- Disk drives 81
- 3–4 HSG80 User’s Guide 82
- Creating Storagesets 3–5 83
- Creating Storagesets 3–7 85
- Choosing a Storageset Type 86
- Creating Storagesets 3–9 87
- 3–10 HSG80 User’s Guide 88
- Creating Storagesets 3–11 89
- 3–12 HSG80 User’s Guide 90
- CXO5506A 91
- 3–14 HSG80 User’s Guide 92
- Creating Storagesets 3–15 93
- 3–16 HSG80 User’s Guide 94
- CXO5508A 95
- 3–18 HSG80 User’s Guide 96
- Cloning Data for Backup 97
- 3–20 HSG80 User’s Guide 98
- Creating Storagesets 3–21 99
- 3–22 HSG80 User’s Guide 100
- Creating Storagesets 3–23 101
- 3–24 HSG80 User’s Guide 102
- Creating Storagesets 3–25 103
- 3–26 HSG80 User’s Guide 104
- Creating Storagesets 3–27 105
- 3–28 HSG80 User’s Guide 106
- Assigning Unit Offsets 107
- Assigning Access Paths 108
- Creating Storagesets 3–31 109
- Creating a Storageset Map 110
- Creating Storagesets 3–33 111
- 3–34 HSG80 User’s Guide 112
- Creating Storagesets 3–35 113
- CXO6186A 114
- Planning Partitions 115
- 3–38 HSG80 User’s Guide 116
- Enabling Switches 117
- Changing Switches 117
- RAIDset Switches 118
- Membership 119
- Mirrorset Switches 120
- Read Source 121
- Device Switches 122
- Creating Storagesets 3–45 123
- Device Transfer Rate 124
- Initialize Switches 125
- 3–48 HSG80 User’s Guide 126
- Creating Storagesets 3–49 127
- Save Configuration 128
- Creating Storagesets 3–51 129
- Configurations 130
- Destroy/Nodestroy 130
- Creating Storagesets 3–53 131
- Unit Switches 132
- Adding Disk Drives 133
- Configuring a Stripeset 133
- Configuring a Mirrorset 134
- Configuring a RAIDset 135
- 3–58 HSG80 User’s Guide 136
- Creating Storagesets 3–59 137
- 3–60 HSG80 User’s Guide 138
- Creating Storagesets 3–61 139
- 3–62 HSG80 User’s Guide 140
- Creating Storagesets 3–63 141
- 3–64 HSG80 User’s Guide 142
- Enabling Autospare 143
- Deleting a Storageset 143
- 3–66 HSG80 User’s Guide 144
- Changing Device Switches 145
- Changing Initialize Switches 145
- Changing Unit Switches 145
- 3–68 HSG80 User’s Guide 146
- Finding the CCL Location 147
- SCSI-2 Mode 147
- SCSI-3 Mode 148
- Moving Storagesets 150
- Creating Storagesets 3–73 151
- 3–74 HSG80 User’s Guide 152
- Creating Storagesets 3–75 153
- Troubleshooting 155
- Troubleshooting Checklist 156
- Troubleshooting 4–3 157
- Troubleshooting Table 158
- Troubleshooting 4–5 159
- 4–6 HSG80 User’s Guide 160
- Troubleshooting 4–7 161
- 4–8 HSG80 User’s Guide 162
- Troubleshooting 4–9 163
- 4–10 HSG80 User’s Guide 164
- Troubleshooting 4–11 165
- 4–12 HSG80 User’s Guide 166
- Troubleshooting 4–13 167
- Significant Event Reporting 168
- Last Failure Reporting 169
- Spontaneous Event Log 170
- CLI Event Reporting 170
- Fault Management Utility 171
- Displaying Failure Entries 171
- Translating Event Codes 172
- Troubleshooting 4–19 173
- 4–20 HSG80 User’s Guide 174
- Troubleshooting 4–21 175
- 4–22 HSG80 User’s Guide 176
- Troubleshooting 4–23 177
- 4–24 HSG80 User’s Guide 178
- Troubleshooting 4–25 179
- 4–26 HSG80 User’s Guide 180
- Troubleshooting 4–27 181
- 4–28 HSG80 User’s Guide 182
- Troubleshooting 4–29 183
- 4–30 HSG80 User’s Guide 184
- Troubleshooting 4–31 185
- 4–32 HSG80 User’s Guide 186
- Troubleshooting 4–33 187
- 4–34 HSG80 User’s Guide 188
- Troubleshooting 4–35 189
- Tachyon Status 190
- Troubleshooting 4–37 191
- 4–38 HSG80 User’s Guide 192
- Troubleshooting 4–39 193
- 4–40 HSG80 User’s Guide 194
- DILX Error Codes 195
- 4–42 HSG80 User’s Guide 196
- Replacement Procedures 197
- 5–2 HSG80 User’s Guide 198
- Configuration 199
- Replacement Procedures 5–5 201
- 5–10 HSG80 User’s Guide 206
- Replacement Procedures 5–11 207
- 5–12 HSG80 User’s Guide 208
- Replacement Procedures 5–13 209
- 5–14 HSG80 User’s Guide 210
- 5–16 HSG80 User’s Guide 212
- Replacement Procedures 5–17 213
- Replacement Procedures 5–19 215
- 5–20 HSG80 User’s Guide 216
- Controller Configuration 217
- 5–22 HSG80 User’s Guide 218
- Replacement Procedures 5–23 219
- Replacement Procedures 5–25 221
- 5–26 HSG80 User’s Guide 222
- Building Block 223
- Powered On 224
- Powered Off 225
- 5–30 HSG80 User’s Guide 226
- Replacement Procedures 5–31 227
- Replacing a GLM 228
- Installing a GLM 229
- Replacing a PVA Module 230
- Replacement Procedures 5–35 231
- Enclosure 232
- Replacement Procedures 5–37 233
- 5–38 HSG80 User’s Guide 234
- Replacing an I/O Module 235
- 5–40 HSG80 User’s Guide 236
- Replacement Procedures 5–41 237
- Replacing DIMMs 238
- Removing DIMMs 239
- Installing DIMMs 240
- Remove a Fibre Cable or Hub 241
- Install a Fibre Cable or Hub 241
- Replacing a PCMCIA Card 242
- Installing the New Member 243
- Shutting Down the Subsystem 244
- Replacement Procedures 5–49 245
- Restarting the Subsystem 246
- Upgrading the Subsystem 247
- Upgrading Controller Software 248
- Downloading New Software 249
- 6–4 HSG80 User’s Guide 250
- Upgrading the Subsystem 6–5 251
- Installing a Software Patch 252
- Deleting a Software Patch 253
- 6–8 HSG80 User’s Guide 254
- Listing Software Patches 255
- 5. Enter option 0, Exit 256
- CXO5606A 257
- 6–12 HSG80 User’s Guide 258
- Upgrading the Subsystem 6–13 259
- HSUTIL Messages 260
- Upgrading the Subsystem 6–15 261
- 6–16 HSG80 User’s Guide 262
- Upgrading the Subsystem 6–17 263
- 6–18 HSG80 User’s Guide 264
- Upgrading the Subsystem 6–19 265
- Upgrading Cache Memory 266
- Upgrading the Subsystem 6–21 267
- 6–22 HSG80 User’s Guide 268
- System Profiles 269
- Device Profile 270
- Storageset Profile 271
- Enclosure Template 272
- CLI Commands 273
- CLI Overview 274
- Getting Help 275
- Entering CLI Commands 275
- Changing the CLI Prompt 276
- Command Syntax 277
- ADD CONNECTIONS 279
- Switches 280
- Examples 281
- See also 282
- ADD DISK 283
- ADD MIRRORSET 287
- B–16 HSG80 User’s Guide 288
- ADD RAIDSET 291
- B–20 HSG80 User’s Guide 292
- ADD SPARESET 295
- ADD STRIPESET 297
- ADD UNIT 299
- CLI Commands B–29 301
- B–30 HSG80 User’s Guide 302
- CLI Commands B–31 303
- B–32 HSG80 User’s Guide 304
- CLEAR_ERRORS CLI 307
- Parameters 309
- CONFIGURATION RESET 317
- CONFIGURATION RESTORE 319
- CONFIGURATION SAVE 321
- CREATE_PARTITION 323
- B–52 HSG80 User’s Guide 324
- DELETE connections 327
- DELETE container-name 329
- DELETE FAILEDSET 331
- DELETE SPARESET 333
- DELETE unit-number 335
- DESTROY_PARTITION 337
- DIRECTORY 339
- INITIALIZE 343
- CLI Commands B–73 345
- CLI Commands B–75 347
- B–80 HSG80 User’s Guide 352
- POWEROFF 355
- B–84 HSG80 User’s Guide 356
- CLI Commands B–85 357
- RESTART controller 363
- RETRY_ERRORS UNWRITEABLE_DATA 365
- Parameter 367
- B–96 HSG80 User’s Guide 368
- SELFTEST controller 371
- SET connection-name 373
- SET controller 375
- B–104 HSG80 User’s Guide 376
- CLI Commands B–105 377
- B–106 HSG80 User’s Guide 378
- CLI Commands B–107 379
- B–108 HSG80 User’s Guide 380
- SET device-name 383
- B–114 HSG80 User’s Guide 386
- SET FAILEDSET 389
- SET FAILOVER 391
- SET mirrorset-name 393
- B–122 HSG80 User’s Guide 394
- CLI Commands B–123 395
- SET MULTIBUS_FAILOVER 399
- SET NOFAILOVER 401
- SET NOMULTIBUS_FAILOVER 403
- SET RAIDset-name 405
- B–134 HSG80 User’s Guide 406
- SET unit-number 409
- B–138 HSG80 User’s Guide 410
- CLI Commands B–139 411
- B–140 HSG80 User’s Guide 412
- CLI Commands B–141 413
- B–144 HSG80 User’s Guide 416
- B–146 HSG80 User’s Guide 418
- CLI Commands B–147 419
- SHUTDOWN controller 421
- UNMIRROR 423
- LED Codes 425
- C–2 HSG80 User’s Guide 426
- Solid OCP Patterns 427
- C–4 HSG80 User’s Guide 428
- LED Codes C–5 429
- C–6 HSG80 User’s Guide 430
- LED Codes C–7 431
- Flashing OCP Patterns 432
- LED Codes C–9 433
- APPENDIX D 435
- D–2 HSG80 User’s Guide 436
- D–4 HSG80 User’s Guide 438
- CXO5314B 439
- D–6 HSG80 User’s Guide 440
- CXO6177A 441
- D–8 HSG80 User’s Guide 442
- CXO6179A 443
- D–10 HSG80 User’s Guide 444
- CXO6180A 445
- D–12 HSG80 User’s Guide 446
- CXO6182A 447
- D–14 HSG80 User’s Guide 448
- Response Format 449
- 01010302 450
- NR Threshold 451
- Repair Action 451
- Event Number 451
- Component ID 451
- D–18 HSG80 User’s Guide 452
- D–20 HSG80 User’s Guide 454
- D–22 HSG80 User’s Guide 456
- D–24 HSG80 User’s Guide 458
- D–26 HSG80 User’s Guide 460
- D–28 HSG80 User’s Guide 462
- D–30 HSG80 User’s Guide 464
- D–32 HSG80 User’s Guide 466
- D–34 HSG80 User’s Guide 468
- 01000102 470
- Restart Code 471
- Error Numbers 471
- Component IDs 472
- D–40 HSG80 User’s Guide 474
- D–42 HSG80 User’s Guide 476
- D–44 HSG80 User’s Guide 478
- D–46 HSG80 User’s Guide 480
- D–48 HSG80 User’s Guide 482
- D–50 HSG80 User’s Guide 484
- D–52 HSG80 User’s Guide 486
- D–54 HSG80 User’s Guide 488
- D–56 HSG80 User’s Guide 490
- D–58 HSG80 User’s Guide 492
- D–60 HSG80 User’s Guide 494
- D–62 HSG80 User’s Guide 496
- D–64 HSG80 User’s Guide 498
- D–66 HSG80 User’s Guide 500
- D–68 HSG80 User’s Guide 502
- D–70 HSG80 User’s Guide 504
- D–72 HSG80 User’s Guide 506
- D–74 HSG80 User’s Guide 508
- D–76 HSG80 User’s Guide 510
- D–78 HSG80 User’s Guide 512
- D–80 HSG80 User’s Guide 514
- Component Identifier Codes 516
- Event Threshold Codes 518
- ASC/ASCQ Codes 519
- D–86 HSG80 User’s Guide 520
- Controller Specifications 523
- E–2 HSG80 User’s Guide 524
- Environmental Specifications 525
- G–2 HSG80 User’s Guide 528
- Glossary G–3 529
- G–4 HSG80 User’s Guide 530
- Glossary G–5 531
- G–6 HSG80 User’s Guide 532
- Glossary G–7 533
- G–8 HSG80 User’s Guide 534
- Glossary G–9 535
- G–10 HSG80 User’s Guide 536
- Glossary G–11 537
- G–12 HSG80 User’s Guide 538
- Glossary G–13 539
- G–14 HSG80 User’s Guide 540
- Glossary G–15 541
- G–16 HSG80 User’s Guide 542
- Glossary G–17 543
- G–18 HSG80 User’s Guide 544
- Glossary G–19 545
- G–20 HSG80 User’s Guide 546
- Glossary G–21 547
- G–22 HSG80 User’s Guide 548
- I–2 HSG80 User’s Guide 550
- Index I–3 551
- I–4 HSG80 User’s Guide 552
- Index I–5 553
- I–6 HSG80 User’s Guide 554
- Index I–7 555
- I–8 HSG80 User’s Guide 556
- Index I–9 557
- I–10 HSG80 User’s Guide 558
- Index I–11 559
- I–12 HSG80 User’s Guide 560
- Index I–13 561
- I–14 HSG80 User’s Guide 562
- Index I–15 563
- I–16 HSG80 User’s Guide 564
- Index I–17 565
- I–18 HSG80 User’s Guide 566
- Index I–19 567
- I–20 HSG80 User’s Guide 568
- Index I–21 569
- I–22 HSG80 User’s Guide 570
- Index I–23 571
- I–24 HSG80 User’s Guide 572
- Index I–25 573
- I–26 HSG80 User’s Guide 574
- Index I–27 575
- I–28 HSG80 User’s Guide 576
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