Compaq 4354R - StorageWorks Enclosure Storage Manual de servicio Pagina 71
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Planning Storage 2–17
Figure 2–12. Mirrorsets maintain two copies of the same data
Figure 2–13. Mirrorset example 2
Keep these points in mind when planning mirrorsets:
■ Data availability with a mirrorset is excellent but comes with a higher cost—you need
twice as many disk drives to satisfy a given capacity requirement. If availability is your
top priority, consider using dual-redundant controllers and redundant power supplies.
■ You can configure up to 20 mirrorsets per controller or pair of dual-redundant
controllers. Each mirrorset may contain up to 6 members.
■ Both write-back cache modules must be the same size.
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CXO7288A
A'A
B'
B
C'C
Mirror drives contain
copy of data
Operating
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view
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device
mappings
Mirrorset
CXO4594B
Disk 1
Block 0
Block 1
Block 2
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Disk 2
Block 0
Block 1
Block 2
etc.
Virtual disk
Block 0
Block 1
Block 2
etc.
- Compaq StorageWorks 1
- First Edition (June 2001) 2
- Part Number: AA-RFAUD-TE 2
- Contents 3
- Chapter 2 4
- Chapter 3 5
- About this Guide 15
- Text Conventions 16
- Symbols in Text 17
- Symbols on Equipment 17
- Rack Stability 18
- Configuration Flowchart 19
- About this Guide xxi 21
- Getting Help 22
- Compaq Technical Support 22
- Compaq Website 23
- Compaq Authorized Reseller 23
- Chapter 1 25
- Planning a Subsystem 25
- Defining the Subsystems 26
- Controller” 27
- Model 2200 Enclosure 28
- Selecting a Failover Mode 29
- —normal operation 30
- Multiple-Bus Failover Mode 31
- Selecting a Cache Mode 33
- Read Caching 34
- Read-Ahead Caching 34
- Write-Back Caching 34
- Write-Through Caching 34
- Enabling Mirrored Caching 35
- The Command Console LUN 35
- Enabling the CCL 36
- Disabling the CCL 36
- D100 D101 D120D0 D1 38
- Planning a Subsystem 1–15 39
- Assigning Unit Numbers 40
- 0). Unit D102 will 41
- CXO6455B 42
- Failover Mode 43
- SCSI-3 Mode 44
- SCSI-2 Mode 44
- Switch or hub 46
- Planning a Subsystem 1–25 49
- Planning a Subsystem 1–29 53
- SHOW command to list the LUN 54
- Planning Storage 55
- Where to Start 56
- Configuration Rules 57
- CXO5851B 58
- Planning Storage 2–7 61
- Planning Storage 2–9 63
- CXO6186B 64
- Choosing a Container Type 65
- Creating a Storageset Profile 66
- Planning Storage 2–13 67
- CXO7287A 68
- CXO4592B 69
- A'A 71
- C'C 71
- Operating 72
- CXO7289A 74
- Controller 75
- Defining a Partition 76
- Switches 77
- Changing Switches 78
- RAIDset Switches 78
- Initialization Switches 79
- Chunk Size 80
- Save Configuration 82
- Destroy/Nodestroy 82
- Geometry 82
- Unit Switches 83
- Storage Maps 83
- Planning Storage 2–31 85
- − example storage map 85
- Planning Storage 2–33 87
- − example storage map 87
- Planning Storage 2–35 89
- Planning Storage 2–37 91
- Preparing the Host System 93
- Preparing the Host System 3–3 95
- CXO7382A 96
- Making a Physical Connection 97
- FileSystem 98
- Mounting the Filesystem 99
- Using genvmunix 100
- File Utility 101
- Reading from the device, dd 102
- For V4.0G and V5.1x 103
- V4.0G Output 103
- V5.1x Output 103
- For V4.0G 104
- For V5.1x 105
- Chapter 4 107
- Before Installing the Agent 111
- Enter Subsystem Information 113
- Final System Configuration 115
- Reconfiguring the Agent 119
- −Can use the 120
- Removing the Agent 121
- Chapter 5 123
- Configuration Procedures 123
- CXO7181A 124
- Cabling a Single Controller 125
- Connections 126
- Configure Controller Settings 127
- Restart the Controller 128
- Verify Installation 130
- For V4.0G Use 130
- For V5.1x Use 130
- Setting Up a Controller Pair 131
- CXO6887B 132
- Configuring Devices 137
- Configuring a Stripeset 137
- Configuring a Mirrorset 137
- Configuring a RAIDset 138
- Configuring a Partition 140
- Preferring Units 142
- Configuration Options 143
- Enabling Autospare 144
- Deleting a Storageset 145
- Changing Device Switches 146
- Changing Initialize Switches 146
- Changing Unit Switches 146
- Chapter 6 147
- Chapter 7 149
- Figure 7–2. Example system 151
- CLI Configuration Example 152
- Chapter 8 159
- Cloning Data for Backup 160
- RUN CLONE 161
- Moving Storagesets 164
- Appendix A 167
- Subsystem Profile Templates 167
- Storageset Profile 168
- Enclosure 169
- BA370 Enclosure 170
- 4214R Disk Enclosure 172
- 4254 Disk Enclosure 173
- 4310R Disk Enclosure 175
- 4350R Disk Enclosure 177
- 4314R Disk Enclosure 178
- 4354R Disk Enclosure 180
- Appendix B 181
- Before You Install the Client 182
- Installing the Client 182
- During Installation 183
- Host to the Navigation Tree 185
- About the User Guide 188
- About the Online Help 188
- Glossary 189
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