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Mirrorclone FAQ
• How can I tell a mirrorclone from other types of virtual disks?
Because mirrorclones are not independent virtual disks, they are identified differently than
original (independent) virtual disks. See virtual disk Types.
• How long does it take to create a mirrorclone?
A mirrorclone requires only a matter of seconds to create.
• What do the terms synchronized and fractured refer to?
When a mirrorclone is in a synchronized state, the local replication link to its source is active.
Changes to data on the source are automatically replicated to the mirrorclone.
When a mirrorclone is in a fractured state, the local replication link is inactive. Changes to
data on the source are not replicated to the mirrorclone.
See Synchronized mirrorclones and Fractured mirrorclones.
• When can a host read from or write to a mirrorclone?
Hosts can read from and write to fractured mirrorclones but not synchronized mirrorclones.
• After I create a mirrorclone, can I delete the source virtual disk?
No.
• Can I make multiple mirrorclones of a virtual disk?
No. See “Mirrorclone guidelines” (page 265).
• What is the maximum number of mirrorclones on a storage system?
There is no limit.
• Can I create a mirrorclone of a mirrorclone?
No.
• Can I create snapclones of a mirrorclone?
No.
• Can I create snapshots of a mirrorclone?
Yes.
• Can I use the round robin feature to make multiple snapshots of a fractured mirrorclone?
Yes.
• Can I create mirrorclones of virtual disks that are in DR groups?
Yes, but only with specific versions of controller software. See Controller software features -
local replication
Mirrorclone guidelines
The following general guidelines apply:
• The array must have a local replication license. See Replication licenses overview.
• A mirrorclone can be in a different disk group than its source. For optimum protection from
hardware failures, HP recommends creating a mirrorclone in a different disk group than its
source. (A mirrorclone is created in the same disk group as its source, unless specified
otherwise.)
• The redundancy (Vraid) level of a mirrorclone can be the same, lower, or higher than its
source. See Redundancy level (Vraid).
Virtual disk concepts 265
- User Guide 1
- Contents 3
- 4 Contents 4
- Contents 5 5
- 6 Contents 6
- Contents 7 7
- 8 Contents 8
- Contents 9 9
- 10 Contents 10
- Contents 11 11
- 12 Contents 12
- Prerequisites 13
- Compatibility 13
- Logging in to the GUI 13
- Capabilities 14
- Local replication 15
- Remote replication 15
- Server software 15
- Host agent software 16
- CLUI software 16
- GUI window overview 18
- Configuration window 18
- Content pane 19
- CLUI window (in the GUI) 19
- Right-click actions 20
- General shortcuts 20
- Button shortcuts 20
- List view shortcuts 20
- Menu bar 21
- Navigation pane 22
- Online help 22
- Status bar 22
- Configuration 23
- CLUI ports configuration 24
- RSM database cleanup 24
- Logs configuration 25
- Simulation mode 26
- RSM database 27
- About exports 28
- About imports 28
- Exporting an RSM database 28
- Importing an RSM database 29
- Completing imports 30
- Troubleshooting 31
- Illegal characters 32
- Troubleshooting 33 33
- Troubleshooting 37 37
- Troubleshooting–HP-UX 38
- Troubleshooting 39 39
- Troubleshooting–Linux 40
- Troubleshooting–Tru64 UNIX 40
- 2 Replication resources 41
- Filtering displayed resources 42
- Global refresh monitor 43
- Refreshing resources (global) 45
- Resource concepts 46
- Resource states 47
- Licenses 49
- ◦ Expiration date (if any) 50
- Security Credentials 51
- 52 Replication resources 52
- Topology views 54
- Displaying the topology tab 55
- DR groups topology view 56
- Host volumes topology view 57
- Features 58
- Virtual disks topology view 59
- Filters for topology views 61
- Tips (topology views) 61
- Pinned view 62
- Clear all pins action 62
- Toggle labels action 62
- 3 DR groups 63
- Create DR group 64
- Configure DR group 64
- Delete DR group 65
- Edit DR group 65
- Manage sets of DR groups 65
- Other DR group tasks 65
- View DR groups 65
- DR group properties summary 66
- DR group views 66
- Deleting a DR group pair 68
- Editing DR group properties 68
- Failing over a DR group pair 69
- Forcing a full copy 70
- Resuming a DR group pair 72
- Suspending a DR group pair 73
- Using DR groups 74
- Creating and deleting 75
- Editing (setting) properties 75
- Viewing DR groups 76
- Viewing DR group properties 76
- DR group concepts 77
- DR group names 78
- Auto suspend on link-down 79
- Auto suspend on full copy 79
- Controller software versions 80
- Cascaded replication 81
- Copy state 81
- Destination access mode 81
- DR group states and icons 81
- Failover 82
- DR group concepts 83 83
- Full copy mode 84
- I/O throttling 85
- Job command processing 85
- Log and disk group planning 86
- Log size 86
- Log disk and states 88
- Low-level refresh 89
- Managed sets of DR groups 89
- Operational state - blocked 90
- Suspend on failover 92
- Suspension state 92
- Write mode transitions 93
- 94 DR groups 94
- 4 Enabled hosts 95
- Enabled hosts views 97
- Adding enabled hosts 97
- Adding VM servers 98
- Changing enabled host OS type 99
- Deleting enabled hosts 99
- Deleting VM servers 100
- Considerations 102
- Procedure 102
- Viewing enabled hosts 103
- Viewing VM server properties 103
- VM server actions summary 104
- VM server properties summary 104
- Enabled host concepts 105
- Host names and ports 106
- VM servers 106
- 5 Host volumes 107
- Host volume groups 108
- Host disk devices 108
- Dynamic capacity volumes 108
- Replicas 109
- Create host volume resources 109
- Delete host volume resources 109
- Manage sets of resources 110
- Mount host volume resources 110
- Host volume views 112
- List view 113
- 114 Host volumes 114
- Creating host volumes 116
- Creating local replicas 116
- Creating round-robin replicas 117
- Deleting replicas 117
- Editing replica properties 118
- Using snapclones 122
- Using snapshots 122
- Using raw disks 123
- Viewing host volume resources 124
- Working with host volumes 127 127
- Host volume concepts 128
- Host volumes FAQ 129
- Disk Devices 129
- File system types 130
- Instant Restore 130
- Automatic LUN assignment 131
- Partitions and slices 132
- Linux partitions 133
- Solaris slices 133
- Raw disks 134
- Local replication wizard 135
- Replica repository 135
- Round robin replicas (wizard) 135
- Snapclones (host volume) 136
- Snapshots (host volume) 136
- Snapshot FAQ 136
- Types (components) 137
- Dynamic capacity management 138
- DC-Management support 140
- 142 Host volumes 142
- DC-Management FAQ 143
- DC-Management best practices 144
- DC-Management examples 144
- Working with jobs 145
- Job Planning - Tru64 UNIX 146
- Job actions cross reference 147
- Job properties summary 148
- Job views 148
- Aborting job instances 149
- Continuing job instances 150
- Copying jobs 150
- Creating jobs 150
- Deleting jobs 151
- Deleting job instances 151
- Developing jobs 152
- Editing jobs 152
- Exporting jobs 152
- CLUI Procedure 153
- Adding a command 153
- Copying lines 153
- Changing one line 153
- Generating job templates 155
- Importing jobs 156
- Importing legacy jobs 156
- Pausing job instances 161
- Resource is not selectable 161
- Running jobs 162
- Scheduling job events 163
- Editing scheduled job events 164
- Choosing a run interval 165
- Removing scheduled job events 165
- Validating jobs 166
- Viewing job status 167
- Job concepts 168
- Jobs, templates, and commands 169
- Job instances 169
- Aborted job instances 170
- Arguments 170
- Argument lists 170
- Assignments (variables) 170
- Branches 171
- Commands 171
- Command result values 172
- Job commands list 178
- Job templates list 184
- Pause and continue 185
- Continue 186
- DR groups 186
- Enabled hosts 187
- Host volumes 187
- Storage systems 187
- Status and states 188
- Transactions 188
- Validation 189
- Wait/nowait argument 190
- Job templates 191
- Template options 192
- Template summary 193
- Comments 194
- Template Options 196
- 7 Managed sets 226
- Managed set views 227
- Creating managed sets 228
- Deleting managed sets 228
- Renaming managed sets 229
- Viewing managed sets 229
- Managed sets concepts 230
- General guidelines 231
- 8 Storage systems 232
- Storage system views 233
- Launching the device manager 234
- Setting DR Protocol Type 235
- Storage system concepts 236
- Storage system concepts 237 237
- Disk groups 238
- Remote replication tunnels 238
- Storage system types 239
- 9 Virtual disks 240
- Create virtual disks 241
- Delete virtual disks 241
- Edit virtual disks 241
- Manage virtual disks 241
- Mount virtual disks 242
- Other virtual disk tasks 242
- Replicate virtual disks 242
- Validate virtual disks 242
- View virtual disks 242
- Virtual disk views 243
- Creating a DR group pair 244
- Creating mirrorclones 245
- Creating snapshots (standard) 246
- Migrating a virtual disk 247
- Creating virtual disks 247
- Deleting virtual disks 248
- Detaching mirrorclones 248
- Fracturing mirrorclones 249
- Presenting virtual disks 251
- Resynchronizing mirrorclones 253
- Migrating a mirrorclone 254
- Unpresenting virtual disks 254
- Virtual disk concepts 255
- Controller software features 256
- Cache policies 256
- Containers 257
- Container guidelines 258
- Cross Vraid replication 258
- Cross Vraid FAQ 258
- Cross Vraid guidelines 260
- Virtual disk concepts 261 261
- Instant restore 262
- Mirrorclones - fractured 263
- Mirrorclones - synchronized 264
- Mirrorclone FAQ 265
- Mirrorclone guidelines 265
- Mirrorclone states 267
- Normalization 267
- Preferred controller 267
- Presentation (to host) 268
- Remote replication guidelines 268
- Redundancy (Vraid) levels 269
- Snapclones 269
- Snapclone FAQ 270
- Snapclone guidelines 271
- Snapshots 271
- Snapshot guidelines 272
- Snapshots per virtual disk 273
- Thin provisioning 274
- Mounting 275
- 10 Events 276
- Refreshing display panes 277
- Organizing displayed events 277
- Viewing events 278
- Viewing the trace log 278
- Event concepts 279
- Events log 280
- Event log views 281
- Event severity 281
- Trace log 281
- Accessing the CLUI via GUI 282
- CLUI documentation 282
- Reusing CLUI commands 284
- Using CLUI help 284
- Displaying the full help menu 285
- Release history 286
- Contacting HP 288
- Related information 288
- Locating documentation 289
- Glossary 290
- 292 Glossary 292
- 294 Index 294
- 296 Index 296
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