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If you do not want to reverse the primary data volume and the secondary data volume, you will
be able to cope with a temporary increase in data transfers and a communications path failure
between the primary storage system and the secondary storage system if the master journal volume
satisfies the conditions mentioned earlier. Therefore, the data transfer speed and the volume capacity
required for the restore journal volumes are smaller than those required for the master journal
volumes. Note that the data transfer speed for the journal volumes must exceed the data transfer
speed in normal status.
Factors That Determine Data Transfer Speed Between the Primary and
Secondary Storage System
The speed of the data transfer between the primary storage system and the secondary storage
system depends on the following factors:
• The bandwidth of the data transfer paths
• The journal transfer speed of the DKC
The data transfer speed between the primary storage system and the secondary storage system
must exceed the data transfer speed in normal status, mentioned in Figure 52 (page 112). If a
temporary increase in transferred data occurs and the data transfer speed between the primary
storage system and the secondary storage system is exceeded, the excess data will be stored
temporarily in the journal volumes.
Figure 52 Data Transfer Speed with XP Continuous Access Journal (Data Transfer Speed Between
the Primary Storage System and the Secondary Storage System)
Bandwidth of Data Transfer Paths
The bandwidth (that is, the data transfer speed) of the data transfer paths between the primary
storage system and the secondary storage system depends on the user's environment. The bandwidth
must exceed the data transfer speed in normal status mentioned earlier.
Journal Transfer Speed of the DKC
The journal transfer speed of the DKC depends on the number of paths used for transferring journals.
The number of paths for transferring journals must be enough so that the journal transfer speed
exceeds the data transfer speed in the normal status mentioned earlier. The maximum number of
paths for each pair of the primary DKC and the secondary DKC is 8.
112 Preparing for XP Continuous Access Journal Operations
- HP StorageWorks 1
- Journal Software User Guide 1
- Contents 3
- 4 Contents 4
- Contents 5 5
- 6 Contents 6
- Contents 7 7
- Journal Software 8
- Features 9
- Benefits 9
- Business Solutions 10
- Functionality Overview 11
- Journal Obtain 12
- Journal Copy 12
- Journal Restore 12
- Storage Systems 14
- Logical Disk Controllers 14
- Systems) 15
- Consistency Groups 15
- Remote Copy Connections 16
- Journal Groups 17
- Data Volume Pairs 18
- Journal Volumes 18
- DKU (drive) 19
- Host Failover Software 20
- Initial Copy Operation 21
- Update Copy Operation 22
- Journal Group Operations 23
- Update Copy Failure 24
- Journal Processing 25
- Types of Journals 26
- Pair Status 32
- Split Types (PSUS) 38
- Suspend Types 40
- Suspension Condition 41
- Requirements and Restrictions 43
- Logical Unit (LU) Types 45
- Maximum Number of Pairs 47
- Installing the Hardware 51
- Installing the Hardware 53 53
- Access Journal Operations 54
- Primary Site 64
- Access Journal Volumes 72
- Virtual LUN 75
- Cache Residency Manager 76
- LUN Manager 76
- XP Thin Provisioning 76
- XP Performance Control 76
- XP Business Copy 76
- 3DC Cascading Configuration) 93
- Basic Behavior 101
- Hardware Configuration 102
- Setup Procedure 103
- Restrictions About 2DC 104
- Data Retention Utility 106
- XP Auto LUN Software 108
- Planning of Journal Volumes 109
- Arranging Journal Volumes 110
- Journal Volume Capacity 110
- Secondary Storage System 112
- Disk Array 113
- Configuration 114
- Journal Operation Window 116
- Pair Operation Window 122
- DKC Operation Window 130
- Usage Monitor Window 136
- History Window 137
- Optional Operation Window 141
- Configuring Port Attributes 144
- Systems (Add DKC) 147
- Adding Logical Paths 150
- Adding Logical Paths 151 151
- Deleting Logical Paths 155
- Turning Power On 158
- 6 Using Journal Groups 159
- 160 Using Journal Groups 160
- 166 Using Journal Groups 166
- 168 Using Journal Groups 168
- 170 Using Journal Groups 170
- Deleting a Journal Group 172
- 174 Using Journal Groups 174
- 176 Using Journal Groups 176
- Figure 80 Paircreate Window 183
- Recovering a Pinned Track 197
- 8 Usage Monitor Operations 199
- 200 Usage Monitor Operations 200
- Figure 86 Display Item Window 201
- Performed) 207
- 3DC Cascading configuration 209
- 10 Troubleshooting 218
- 224 Troubleshooting 224
- Calling HP Technical Support 243
- Related Documentation 244
- HP Technical Support 245
- Subscription Service 245
- HP Websites 245
- Documentation Feedback 245
- Glossary 246
- 248 Index 248
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