Hp XP P9500 Storage Bedienungsanleitung Seite 12
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Data path
The physical transmission link between the local and remote systems is called the data path.
Continuous Access Journal commands and data are transmitted through the fibre-channel data
path and switches. The data path is connected to the primary and secondary systems through two
types of fibre-channel ports, Initiator and RCU Target ports. Continuous Access Journal requires
paths in both directions. More specifically, it requires paths with Initiator ports in the MCU connected
to RCU Target ports in the RCU, and paths with Initiator Ports in the RCU connected to RCU Target
ports in the MCU.
One data path connection is required. It is recommended that you use two or more independent
connections to provide hardware redundancy. A maximum of eight paths can be used.
For more information, see “Planning the data path” (page 34).
Consistency groups and journals
Journals are used in Continuous Access Journal to guarantee data consistency across multiple pairs.
Consistency groups are used in other replication software for the same purpose. As a best practice,
you can assign RAID Manager consistency group numbers as journal numbers. See “journals” in
“System requirements” (page 15) and “Multiple journals per RAID Manager consistency group ”
(page 27) for more information.
Remote Web Console
Remote Web Console provides a GUI and command line interface for accessing and managing
the storage system, including Continuous Access Journal.
Remote Web Console communicates with the SVP of each system over defined TCP/IP connections.
RAID Manager (RAID Manager)
RAID Manager provides a command line interface for accessing and managing the storage system,
including Continuous Access Journal. You can perform the same Continuous Access Journal
operations with RAID Manager as you can with Remote Web Console. In addition, you can
automate pair operations using scripts.
If you want to use RAID Manager but it is not installed, contact your HP account team.
Reference Information
The following topics describe Cnt Ac-J copy operations and other features.
Overview of copy operations
initial and update copy operations including the underlying operations, such as journal processing
and differential data management.
Initial copy operation
The initial copy is executed when the primary system copies all the data in sequence from the
P-VOL directly to the S-VOL. Though journal volumes are not used during the initial copy, the copy
data in this operation is referred to as “base journal data”.
• Creating or resynchronizing two or more pairs within the same journal results in the base
journal data being copied to the respective S-VOLs, one at a time. This extends the time
required for all the operations to be completed.
• An initial copy operation can be performed to establish the pair — with no data copied
between the volumes. This can be done when data in the P-VOLs and S-VOLs are identical.
• Continuous Access Journal pair data can also be copied using a Continuous Access
Synchronous initial copy operation. Doing this reduces the time to complete the copy operation.
See “Planning pair volumes ” (page 22) for more information.
12 Continuous Access Journal overview
- User Guide 1
- Contents 3
- 4 Contents 4
- Contents 5 5
- 6 Contents 6
- Contents 7 7
- P9500 storage systems 10
- Pair volumes 11
- Journal volumes 11
- Journals 11
- Reference Information 12
- Differential data management 13
- S-VOL write option 14
- Pair status 14
- System requirements 15
- Plan and design workflow 18
- Write-workload 19
- Sizing journal volumes 20
- Planning journals 20
- RAID group configuration 21
- Planning journal volumes 22
- Planning pair volumes 22
- Planning pair volumes 23 23
- Host failover software 25
- Planning for previous models 29
- System option modes 31
- 4 Planning the data path 34
- Calculating bandwidth 35
- 36 Planning the data path 36
- Sizing bandwidth 37 37
- 38 Planning the data path 38
- Packet loss 39
- Example configuration 40
- Port types 40
- Additional switches 41
- 42 Planning the data path 42
- 5 Configuration operations 44
- 46 Configuration operations 46
- 48 Configuration operations 48
- 50 Configuration operations 50
- 52 Configuration operations 52
- 6 Pair operations 54
- Creating the initial copy 55 55
- 56 Pair operations 56
- Creating the initial copy 57 57
- Splitting pairs 58
- Splitting mirrors 59
- Creating point-in-time copies 60
- Resynchronizing pairs 60
- Resynchronizing pairs 61 61
- Resynchronizing mirrors 62
- Deleting pairs 62
- Deleting pairs 63 63
- Deleting pairs in a mirror 64
- Deleting pairs in a mirror 65 65
- 7 Monitoring the system 66
- PSUS types and behaviors 69
- PSUE types and behaviors 71
- Selecting data to be graphed 74
- Manipulating graph, save data 76
- History of pair operations 79
- 8 Maintaining the system 80
- ◦ Initial 81
- ◦ Stopped 81
- ◦ Hold(Failure) 81
- 82 Maintaining the system 82
- 84 Maintaining the system 84
- Logical path maintenance 86
- Deleting logical paths 87
- When power stops unexpectedly 88
- 90 Maintaining the system 90
- General recovery procedures 91
- Cnt Ac-J secondary site: HOLD 100
- 10 Troubleshooting 103
- Troubleshooting logical paths 105
- B9E2, B9E4, D004 109
- B9E4, D004 112
- Miscellaneous troubleshooting 121
- 122 Troubleshooting 122
- Contacting HP 123
- Related information 123
- Typographic conventions 124
- Overview 126
- Failure recovery 127
- B Sharing volumes 133
- Cache Residency 135
- Data Retention 135
- Thin Provisioning 136
- LUN Expansion 137
- LUN Manager 137
- Fast Snap and Snapshot 137
- 138 Sharing volumes 138
- Virtual LUN 139
- Auto LUN 140
- 3DC cascade configuration 141
- Delta resync configuration 144
- ◦ Use the same mirror ID 146
- Problems that can occur 148
- ◦ Assign it to other mirrors 149
- ◦ Use it with RAID Manager 149
- 2 Data center configuration 151
- Pair status and data currency 156
- E GUI reference 157
- Journal Detail window 159
- Pair Operation window 165
- Paircreate dialog box 169
- Pairsplit-r dialog box 171
- Pairresync dialog box 172
- Pairsplit-S dialog box 173
- Change Pair Option dialog box 174
- Display Filter dialog box 174
- DKC Operation window 175
- Remote systems information 176
- Logical Path Information 177
- DKC Status dialog box 179
- Add DKC dialog box 180
- DKC Option dialog box 181
- Usage Monitor window 182
- History window 183
- Operations in History window 184
- History window notes 185
- Optional Operation window 186
- Glossary 188
- 190 Index 190
- 192 Index 192
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