Compaq HSG80 - StorageWorks RAID Array Controller Spécifications Page 122
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4–16 Compaq StorageWorks HSG80 Array Controller ACS Version 8.5 Maintenance and Service Guide
Table 4–3 Resulting Cache Policies—ECB Status
Cache Module Status Cache Policy
Cache A Cache B Unmirrored Cache Mirrored Cache
At least
50%
charged.
At least
50%
charged.
Data loss: No.
Cache policy: Both controllers continue to
support write-back caching.
Failover: No.
Data loss: No.
Cache policy: Both controllers continue to
support write-back caching.
Failover: No.
Less than
50%
charged.
At least
50%
charged.
Data loss: No.
Cache policy: Controller A supports
write-through caching only; controller B
supports write-back caching.
Failover: In transparent failover, all units
failover to controller B.
In multiple-bus failover with host-assist,
only those units that use write-back
caching, such as RAIDsets and mirrorsets,
failover to controller B.
In single-controller configurations, the
controller only provides write-through
caching to its units.
Data loss: No.
Cache policy: Both controllers continue to
support write-back caching.
Failover: No.
Failed. At least
50%
charged.
Data loss: No.
Cache policy: Controller A supports
write-through caching only; controller B
supports write-back caching.
Failover: In transparent failover, all units
failover to controller B and operate
normally.
In multiple-bus failover with host-assist,
only those units that use write-back
caching, such as RAIDsets and mirrorsets,
failover to controller B.
In single-controller configurations, the
controller only provides write-through
caching to its units.
Data loss: No.
Cache policy: Both controllers continue to
support write-back caching.
Failover: No.
- Second Edition (October 1999) 1
- Compaq Computer Corporation 1
- Maintenance and Service Guide 1
- Contents 3
- Chapter 3 5
- Chapter 4 5
- Chapter 5 7
- Appendix A 7
- About This Guide 13
- Conventions 14
- Related Publications 15
- General Description 17
- CXO6883B 18
- Table 1–1 HSG80 Subsystem 19
- CXO6570B 21
- CXO6604B 22
- Controller Front Panel 23
- CXO6216C 24
- Gigabit Link Module (GLM) 25
- CXO5821B 26
- General Description 1–11 27
- Replacement Procedures 29
- Required Tools 30
- Precautions 30
- Preparation Procedures 31
- CXO6572B 32
- Instructions 33
- Cleaning the GLM 34
- Shutting Down the Subsystem 35
- CXO6991A 36
- Restarting the Subsystem 37
- CXO7072A 38
- Configuration 39
- CXO6613A 40
- SHOW THIS_CONTROLLER FULL 44
- SET THIS_CONTROLLER TIME= 44
- Replacement Procedures 2–17 45
- Replacement Procedures 2–19 47
- Replacement Procedures 2–21 49
- RUN FRUTIL 50
- Replacement Procedures 2–23 51
- HSG80 Array Controller ACS 52
- Replacement Procedures 2–29 57
- Replacement Procedures 2–31 59
- Replacement Procedures 2–35 63
- Replacing an ECB 64
- Replacement Procedures 2–37 65
- Replacement Procedures 2–39 67
- Replacing a GLM 68
- Removing a GLM 69
- Installing a GLM 69
- Replacing a PVA Module 70
- Replacement Procedures 2–43 71
- PVA replacement complete 72
- Please wait . . 72
- Replacing an I/O Module 73
- Replacement Procedures 2–47 75
- Replacing an EMU 76
- Installing an EMU 77
- Replacing DIMMs 78
- Removing DIMMs 79
- Installing DIMMs 79
- Replacement Procedures 2–53 81
- Replacing a Program Card 82
- Replacement Procedures 2–55 83
- Installing the New Member 84
- Upgrading the Subsystem 85
- Upgrading Controller Software 86
- Downloading New Software 87
- CXO5873B 88
- Upgrading the Subsystem 3–5 89
- Installing a Software Patch 90
- Upgrading the Subsystem 3–7 91
- Deleting a Software Patch 92
- Listing Software Patches 93
- CXO5606C 95
- Upgrading the Subsystem 3–13 97
- Upgrading the Subsystem 3–15 99
- Compaq StorageWorks 100
- Upgrading Cache Memory 101
- Upgrading the Subsystem 3–19 103
- CXO6577B 104
- Upgrading the Subsystem 3–21 105
- Troubleshooting Resources 107
- ECB Charging Diagnostics 108
- Battery Hysteresis 108
- Checklist 109
- SHOW DEVICES FULL 110
- SHOW STORAGESETS FULL 110
- SHOW UNITS FULL 110
- Troubleshooting Table 111
- Troubleshooting Resources 4–7 113
- HSG80 Array Controller 114
- ACS Version 8.5 CLI 114
- Reference Guide 114
- Troubleshooting Resources 4–9 115
- HSG80 Array 116
- Controller ACS Version 8.5 116
- CLI Reference Guide 116
- Caching Techniques 118
- Write-Through Caching 119
- Write-Back Caching 119
- Significant Event Reporting 124
- Memory module is missing 127
- Last Failure Reporting 131
- Spontaneous Event Log 132
- Utilities and Exercisers 133
- Displaying Failure Entries 134
- Translating Event Codes 135
- Table 4–6 Event-Code Types 136
- Table 4–7 FMU SET Commands 137
- command 138
- Ctrl/Y Exits VTDPY 140
- (see Figure 4–4) 149
- Known Hosts (Connections) 150
- TACHYON Chip Status 153
- DILX Error Codes 160
- Table 4–22 DILX Error Codes 160
- CONFIG Utility 161
- CLCP Utility 162
- CLONE Utility 162
- CHVSN Utility 163
- Data Response 165
- bit → 76543210 167
- ASC/ASCQ Codes 181
- Repair Action 185
- Event Number 185
- Component ID 186
- SCSI ID 6 205
- SCSI ID 7 205
- 0 1 0 0 0 1 0 2 209
- Error Number 211
- State Work Items 220
- VA Request Items 220
- Component Identifier Codes 257
- Appendix 259
- Environmental Specifications 260
- Controller Specifications A–3 261
- Glossary 263
- Glossary GL–3 265
- Glossary GL–5 267
- Glossary GL–7 269
- Glossary GL–9 271
- Glossary GL–11 273
- Glossary GL–13 275
- Glossary GL–15 277
- Glossary GL–17 279
- Glossary GL–19 281
- Glossary GL–21 283
- Index I–3 287
- Index I–5 289
- Index I–7 291
- Index I–9 293
- Index I–11 295
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