Compaq HSG80 - StorageWorks RAID Array Controller Especificaciones Pagina 370
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GL–24 Glossary
write-back caching A cache management method used to decrease 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.
write-through
caching
A cache management method used to decrease the subsystem’s response time to
a read. This method allows the controller to satisfy the request from the cache
memory rather than from the disk drives.
write hole The period of time in a RAID level 1 or RAID level 5 write operation when an
opportunity emerges for undetectable RAIDset data corruption. Write holes occur
under conditions such as power outages, where the writing of multiple members
can be abruptly interrupted. A battery backed-up cache design eliminates the
write hole because data is preserved in cache and unsuccessful write operations
can be retried.
write-through cache A cache management technique for retaining host write requests in read cache.
When the host requests a write operation, the controller writes data directly to the
storage device. This technique allows the controller to complete some read
requests from the cache, greatly improving the response time to retrieve data. The
operation is complete only after the data to be written is received by the target
storage device.
This cache management method may update, invalidate, or delete data from the
cache memory accordingly, to ensure that the cache contains the most current
data.
- First Edition (April, 1999) 1
- Compaq Computer Corporation 1
- Contents 3
- Chapter 2 4
- Chapter 3 4
- Chapter 4 5
- Chapter 5 6
- Chapter 6 7
- Chapter 7 8
- System Profiles 10
- Controller Specifications 10
- Glossary 10
- About This Guide 15
- Precautions 16
- Maintenance Port Precautions 17
- FCC Precautions 17
- Conventions 18
- Typographical Conventions 19
- Special Notices 20
- Related Publications 21
- About This Guide 22
- Revision History 23
- General Description 25
- General Description 26
- CXO6841A 27
- Summary of HSG80 Features 29
- Controller Components 32
- Cabling (Continued) 33
- Operator Control Panel 35
- Maintenance Port 36
- Utilities and Exercisers 36
- Virtual Terminal Display 37
- Disk Inline Exerciser 37
- Configuration Utility 37
- Clone Utility 38
- Field Replacement Utility 38
- Device Statistics Utility 38
- Cache Module 39
- External Cache Battery 41
- Charging Diagnostics 42
- Battery Hysteresis 43
- Controller and Host Concepts 45
- Terminology 46
- Item Description 47
- ➀ Other controller 47
- ➁ This controller 47
- Selecting a Failover Mode 49
- Shared Port IDs 50
- Separate Port IDs 51
- Preferring the Host Path 52
- Caching Techniques 53
- Write-Through Caching 54
- Write-Back Caching 54
- Nonvolatile Memory 55
- Chapter 3 63
- Bus Dynamics 64
- Host Bus 65
- Controller Device Bus 65
- Containers and Storagesets 66
- Containers 67
- Addressing 68
- Disk 10000 71
- Disk 20000 Disk 30000 71
- Failover Mode 72
- CXO6454B 74
- Assigning Unit Offsets 75
- Assigning Access Paths 76
- (Node IDs) 77
- Planning Storagesets 81
- Disk drives 83
- Choosing a Storageset Type 88
- CXO5507A 89
- ➀ First member of Mirrorset 1 95
- ➁ First member of Mirrorset 2 95
- Availability 96
- I/O Request 97
- Performance and Availability 99
- Stripeset 100
- Cloning Data for Backup 101
- Planning Storagesets 102
- SAVE_CONFIGURATION 107
- INITIALIZE 107
- INITIALIZE DISK 107
- Creating a Storageset Map 110
- Spare spare Spare R1 111
- R2 R2 R2 R2 111
- Spare Spare Spare Spare 111
- M1 M1 M2 M2 111
- Planning Partitions 114
- Disk Drives 115
- Enabling Switches 116
- Changing Switches 116
- RAIDset Switches 117
- Membership 118
- Mirrorset Switches 119
- Read Source 120
- Device Switches 121
- Device Transfer Rate 122
- Initialize Switches 123
- Increasing the Request Rate 124
- CXO-5172A-MC 125
- Save Configuration 126
- Configurations 128
- Destroy/Nodestroy 129
- Chapter 5 131
- Introduction 133
- Controller 134
- Maintenance and Service Guide 136
- RUN FRUTIL 137
- SHOW THIS_CONTROLLER FULL 137
- Using Two Switches 138
- Switches 138
- Using One Switch 140
- IDENTIFIER 151
- Optional Steps 159
- Extended Subsystem 160
- Setting a Port Offline 161
- Backing Up Power with a UPS 161
- CXO6476B 164
- Shutting Down Your Subsystem 166
- Restarting Your Subsystem 167
- Configuring Storagesets 169
- Unit Switches 170
- Adding Disk Drives 171
- Formatting Disk Drives 171
- Configuring Storagesets 172
- Configuring a Stripeset 174
- Configuring a Mirrorset 175
- Configuring a RAIDset 176
- RAIDset-name switch 177
- RAIDset-name 177
- Enabling Autospare 185
- Deleting a Storageset 186
- Changing Device Switches 187
- Changing Initialize Switches 188
- Changing Unit Switches 188
- Finding the CCL Location 190
- SCSI-2 and SCSI-3 Modes 190
- Multiple-Bus Failover 191
- Transparent Failover 191
- SCSI-2 Mode 192
- SCSI-3 Mode 192
- Moving Storagesets 193
- Name Storageset Uses Used by 195
- CLI Commands 197
- CLI Overview 198
- Command Overview 199
- Getting Help 199
- Entering CLI Commands 200
- Changing the CLI Prompt 201
- Command Syntax 201
- ADD CONNECTIONS 202
- CLI Commands 204
- Examples 205
- See also 205
- ADD DISK 206
- ADD MIRRORSET 209
- ADD RAIDSET 213
- ADD REMOTE_COPY_SETS 217
- ADD SPARESET 219
- ADD STRIPESET 220
- ADD UNIT 223
- CLEAR_ERRORS CLI 231
- CLEAR_ERRORS 232
- INVALID_CACHE 232
- UNKNOWN 235
- LOST_DATA 236
- UNWRITEABLE_DATA 238
- CONFIGURATION RESET 240
- CONFIGURATION RESTORE 241
- CONFIGURATION SAVE 243
- CREATE_PARTITION 244
- Parameters 247
- DELETE FAILEDSET 251
- DELETE SPARESET 252
- Parameter 253
- DESTROY_PARTITION 254
- DIRECTORY 256
- LOCATE D102 265
- LOCATE DISKS 265
- LOCATE CANCEL 265
- POWEROFF 270
- RESTART 277
- RETRY_ERRORS UNWRITEABLE_DATA 279
- SELFTEST 283
- Table 7–4. SET 288
- Switches 288
- Switches (Continued) 289
- SET FAILEDSET 302
- SET FAILOVER 304
- SET MULTIBUS_FAILOVER 311
- SET NOFAILOVER 313
- SET NOMULTIBUS_FAILOVER 315
- Table 7–6 SET 323
- SHOW MIRR1 333
- EMU CABINET SETTINGS 335
- FANSPEED AUTOMATIC 335
- SHUTDOWN 336
- UNMIRROR 338
- Device Profile 340
- Storageset Profile 341
- Enclosure Template 342
- Environmental Specifications 345
- B–4 Controller Specifications 346
- GL–2 Glossary 348
- See also 349
- GL–4 Glossary 350
- GL–6 Glossary 352
- GL–8 Glossary 354
- GL–10 Glossary 356
- GL–12 Glossary 358
- GL–14 Glossary 360
- GL–16 Glossary 362
- GL–18 Glossary 364
- GL–20 Glossary 366
- GL–22 Glossary 368
- GL–24 Glossary 370
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