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Parameters related to compacting
As backups are deleted from a deduplicating vault, its deduplication data store (p. 205) may contain
unused data blocks (items) that are no longer referred to from any backup. The storage node
processes the data store to delete the unused items. This operation is called compacting. Compacting
is performed by the compacting task.
Every time the compacting task starts, the storage node determines whether to perform compacting.
To do this, the storage node:
1. Checks the size of the backed up data that has been deleted from the vault since the last
compacting.
2. Uses the Compacting Trigger Rough Estimation Threshold parameter to determine whether this
size, relative to the size of the remaining backed up data, is significant.
3. If so, uses the Compacting Trigger Threshold parameter to determine whether the deduplication
data store contains a significant number of unused items. If so, the storage node performs
compacting.
The parameters are the following.
Compacting Trigger Rough Estimation Threshold
Description: Specifies the relative size of the backed up data that remains in a deduplicating
vault, below which checking for unused items is performed (see the Compacting Trigger
Threshold parameter).
Possible values: Any integer number between 0 and 100
Default value: 90
The Compacting Trigger Rough Estimation Threshold parameter enables you to skip the check
for unused items (and hence skip compacting) when the content of the vault did not change
significantly.
The larger the value of this parameter, the more often the check for unused items will be
performed. The value 100 means that the check will be performed each time the compacting
task starts.
How it works. Assume that the parameter value is 90 and the vault has 100 GB of backed up
data. It does not matter whether this data has duplicates. Then, you delete a few backups and
the backed up data size becomes equal to 80 GB. In this case:
a. The size of the deleted data is 20 GB, and the size of the remaining data is 80 GB. The ratio of
the deleted to remaining data is thus 20 GB / 80 GB = 0.25, or 25 percent.
b. The storage node calculates the relative size of the remaining data as 100 percent
25 percent = 75 percent.
c. Because this relative size is less than 90 percent, the storage node starts checking for unused
items.
Compacting Trigger Threshold
Description: Specifies the percentage of used items in the deduplication data store below which
compacting occurs.
Possible values: Any integer number between 0 and 100
Default value: 90
Since compacting is a resource-consuming operation, it should occur only when the number of
unused items is significant.
- User Guide 1
- Table of contents 3
- All editions 9
- All advanced editions 10
- Virtual Edition 11
- 1.2.1 Agent for Windows 12
- 1.2.2 Agent for Linux 13
- 1.2.4 Agent for Hyper-V 14
- 1.2.6 Management Console 15
- 1.3 Supported file systems 16
- 1.4 Technical Support 17
- 2 Getting started 18
- Step 2. Running 19
- Step 3. Bootable media 19
- Step 4. Connection 19
- Step 5. Backup 19
- Step 6. Recovery 20
- Step 7. Management 20
- Navigation tree 22
- Shortcuts bar 23
- 2.1.2.1 Views 24
- 2.1.2.2 Action pages 25
- Action page - Controls 26
- 2.1.3 Console options 27
- 2.1.3.4 Pop-up messages 28
- 2.1.3.5 Startup page 29
- 3.1 Owners and credentials 30
- Full backup 32
- Incremental backup 32
- Differential backup 33
- Backing up dynamic volumes 34
- Recovering dynamic volumes 34
- (Linux) 36
- Mounting backup volumes 41
- Common installation rule 42
- Common backup rule 42
- 3.7 Support for SNMP 43
- Value: "?00000000" 44
- 4 Backup 45
- How to back up 46
- Plan parameters 46
- To specify credentials 50
- 4.2.5 Backup schemes 51
- 4.2.5.2 Run now scheme 52
- Examples 53
- At a glance 55
- Parameters 55
- Roll-back period 59
- 4.2.5.6 Manual start 60
- 4.2.5.7 Initial seeding 60
- 1. Selecting the destination 61
- 4.2.7 Archive validation 63
- Parameters specification 64
- 4.3.1 Usage examples 66
- 4.4 Scheduling 69
- Schedule 70
- Condition 70
- 4.4.1 Daily schedule 71
- first at 8 AM 72
- second at 12 PM (noon) 72
- third at 3 PM 72
- fourth at 5 PM 72
- fifth at 7 PM 72
- 4.4.2 Weekly schedule 73
- 4.4.3 Monthly schedule 75
- Use Wake-on-LAN 79
- 4.4.7 Conditions 81
- 4.4.7.1 User is idle 82
- 4.4.7.3 Fits time interval 82
- 4.4.7.4 User logged off 83
- Example: 84
- 4.5.1 Supported locations 85
- Restrictions 86
- Simple scheme 87
- Tower of Hanoi scheme 87
- Custom scheme 87
- 4.5.6 Usage examples 89
- Convert to virtual machine 92
- 4.7 Default backup options 95
- 4.7.1 Additional settings 97
- 4.7.2 Archive protection 98
- 4.7.3 Backup cataloging 99
- 4.7.4 Backup performance 100
- 4.7.5 Backup splitting 101
- 4.7.6 Compression level 102
- 4.7.8 Error handling 103
- 4.7.9 Event tracing 104
- 4.7.12 File-level security 106
- 4.7.13 LVM snapshotting 106
- 4.7.14 Media components 107
- 4.7.15 Mount points 108
- 4.7.17 Notifications 109
- 4.7.18 Pre/Post commands 110
- 4.7.18.1 Pre-backup command 111
- 4.7.22 Tape management 114
- Eject tape 115
- Always use a free tape 115
- Skip the task execution 117
- Use VSS 117
- Do not use VSS 118
- Volume shadow copy writers 118
- 5 Recovery 119
- Where to recover 120
- When to recover 120
- Task parameters 120
- 5.1.1 What to recover 121
- 5.1.1.2 Data catalog 123
- 5.1.4 Where to recover 125
- Recover to: 126
- Disks/volumes 126
- Disk #: 126
- Disk destination 127
- NT signature 127
- MBR destination 129
- Volume destination 129
- Changing volume properties 130
- Size and location 130
- File system 130
- Volume (partition) alignment 131
- Recovery exclusions 132
- 5.1.5 When to recover 133
- 5.1.6 Task credentials 133
- During recovery 134
- Without recovery 135
- Preparation 135
- Universal Restore settings 136
- The recovery process 136
- 5.3.1 Recovering volumes 138
- 5.3.2 Recovering disks 139
- 5.4 Acronis Active Restore 141
- Supported operating systems 142
- Limitation 142
- How it works 142
- Usage scenarios 142
- How to use 142
- Post-conversion operations 144
- Storage 145
- Processors 146
- 5.6.2 About Windows loaders 149
- 5.7.1 Additional settings 151
- 5.7.2 Error handling 152
- 5.7.3 Event tracing 152
- 5.7.4 File-level security 153
- 5.7.5 Mount points 154
- 5.7.6 Notifications 154
- 5.7.7 Pre/Post commands 155
- 5.7.8 Recovery priority 157
- 6.1 Vaults 158
- 6.1.1 Working with vaults 159
- 6.1.2 Centralized vaults 160
- User accounts 163
- Vault path 164
- Deduplication database path 164
- Vault encryption 164
- Vault administrators 165
- Vault users 165
- 6.1.3 Personal vaults 167
- Metadata 168
- Creating a personal vault 169
- 6.2 Acronis Secure Zone 170
- To set up a password 171
- To disable password 171
- 6.2.1.4 Result confirmation 172
- 6.3 Tape devices 173
- 6.3.2.2 Supported hardware 174
- Backup options 175
- Backup schemes 175
- 6.3.2.5 Parallel operations 176
- 6.3.2.6 Limitations 176
- Prerequisites 177
- Before backing up 177
- Results 178
- Backing up 178
- 6.3.4 Tape management 181
- 6.3.4.2 Tape pools 182
- Separating filled tapes 182
- Creating a pool 183
- Editing a pool 183
- Deleting a pool 183
- Renaming 184
- Changing pool 184
- Moving to another slot 184
- Ejecting 185
- Erasing 185
- Rescanning 186
- Inventorying 187
- Removing 188
- 6.3.5 Vaults on tapes 189
- 6.3.6 Usage examples 190
- Sequence of actions 191
- 6.4 Storage nodes 193
- Cleanup and validation 194
- Deduplication 194
- Encryption 194
- Setting up the storage node 195
- Backup to the storage node 195
- Managing storage nodes 195
- To access actions 197
- Storage node properties 198
- Template 199
- Other parameters 201
- 6.4.7 Deduplication 204
- Deduplication database 205
- Deduplication at source 205
- Deduplication at target 206
- Compacting 207
- File-level backup 210
- What to validate 211
- 7.1.1 Archive selection 212
- 7.1.2 Backup selection 212
- 7.1.3 Vault selection 212
- 7.1.5 When to validate 213
- 7.1.6 Task credentials 214
- What to export 216
- 7.2.1 Archive selection 217
- 7.2.2 Backup selection 217
- 7.2.4 Destination selection 218
- 2. Using the archives table 219
- 3. Naming the new archive 219
- 7.3 Mounting an image 220
- 7.3.1 Archive selection 221
- 7.3.2 Backup selection 222
- 7.3.3 Access credentials 222
- 7.3.4 Volume selection 222
- Exploring images 223
- Unmounting images 223
- 8 Bootable media 227
- Linux-based bootable media 228
- PE-based bootable media 228
- Using Bart PE 229
- 8.1.1.1 Kernel parameters 230
- 8.1.1.2 Network settings 231
- 8.1.1.3 Network port 232
- \winpe_x86\ISO 235
- Linux commands and utilities 238
- 8.6 Acronis PXE Server 239
- 8.6.3 Work across subnets 241
- 9 Disk management 242
- 9.6 Disk operations 244
- 9.6.2 Basic disk cloning 245
- Using advanced options 246
- System disk conversion 249
- 9.7 Volume operations 250
- Select destination disks 252
- Set the volume size 253
- Set the volume options 253
- 9.7.2 Delete volume 254
- 9.7.3 Set active volume 255
- 9.7.4 Change volume letter 255
- 9.7.5 Change volume label 256
- 9.7.6 Format volume 256
- 9.8 Pending operations 257
- 10.1 Backup plans and tasks 258
- 10.1.2.3 Task states 262
- 10.1.2.4 Task statuses 262
- Usage examples 263
- Adjusting credentials 263
- Steps to perform 263
- Example 265
- Editing the export file 266
- 10.1.5 Backup plan details 267
- 10.2 Log 269
- 10.3 Alerts 270
- Accepting alerts 271
- Configuring alerts 271
- 10.5.2 Alerts 272
- 10.5.3 E-mail notifications 273
- 10.5.4 Event tracing 274
- Windows 275
- 10.5.5 Log cleanup rules 276
- 10.5.6 Machine management 276
- 10.5.7 Online backup proxy 277
- 11 Centralized management 279
- Local connection 280
- Remote connection 280
- Example 1 282
- Example 2 283
- On a domain controller 284
- New accounts 285
- Existing accounts 285
- Tips for further usage 285
- 11.1.3.5 SSL certificates 288
- Self-signed certificates 289
- Non-self-signed certificates 289
- Note on Windows machines 294
- 2. Naming the archives 297
- Management Server 298
- 11.3.2 Machines with agents 299
- 11.3.2.1 Machine groups 300
- Grouping actions 302
- Direct management 302
- Other actions 303
- Text file requirements 304
- Adding machines to a group 305
- Machine details 306
- 11.3.2.3 Actions on groups 308
- Adding multiple criteria 309
- Move one group to another 311
- Editing custom groups 311
- Group details 311
- 11.3.3 Virtual machines 312
- Typical workflow 313
- Recovery task (p. 119) 314
- Validation task (p. 211) 314
- 11.3.5 Storage nodes 315
- 11.3.6 Licenses 316
- 11.3.6.3 Exporting licenses 317
- 11.3.6.4 Removing licenses 317
- 11.3.6.5 Revoking licenses 317
- 11.3.7 Reporting 318
- Filters 319
- Report view 319
- Report coverage 321
- 11.3.7.7 Column selection 322
- 11.3.8 Alerts 323
- 11.3.9 Log 324
- Click Details 325
- 11.3.10.1 Acronis WOL Proxy 326
- 11.3.10.2 Alerts 327
- Alert management 327
- Time-based alerts 327
- Alert notifications 328
- 11.3.10.5 Event tracing 329
- Windows event log 329
- SNMP notifications 330
- 11.3.10.6 Logging level 330
- Log cleanup rules 330
- Connection parameters 342
- Event tracing parameters 344
- 12 Online backup 346
- Server uses a free license 347
- 12.1.7 Initial Seeding FAQ 349
- Hard drive types 351
- Packaging 351
- To renew a subscription 357
- To increase a storage quota 358
- 12.2 Where do I start? 359
- Trial subscriptions 360
- Operations 363
- 12.7 Terminology reference 364
- 13 Glossary 366
- Backup plan (Plan) 368
- Backup scheme 368
- Bootable agent 368
- Bootable media 369
- Built-in group 369
- Cataloging 369
- Centralized backup plan 369
- Centralized management 369
- Centralized task 370
- Centralized vault 370
- Cleanup 370
- Consolidation 370
- Data catalog 371
- Deduplicating vault 371
- Disaster recovery plan (DRP) 372
- Disk backup (Image) 372
- Disk group 372
- Dynamic disk 373
- Dynamic group 373
- Machine 376
- Managed machine 376
- Managed vault 376
- Media builder 376
- Virtual machine 379
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