Hp XP P9500 Storage User Manual Page 143
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• The fence level of the Cnt Ac-S P-VOL must be Data.
• 3DC cascade is not supported for multiple primary and secondary systems. The Cnt Ac-J or
Cnt Ac-S pair in this configuration would be suspended when the status became PAIR or COPY.
• The response time for host I/Os will be the response time for Cnt Ac-S operation plus the
creation time of journal data in the intermediate site.
• The utilization rate on the primary site with a 3DC cascade configuration is higher than if Cnt
Ac-J and a Cnt Ac-S systems are used independently.
Procedure for setting up 3DC cascade
Procedure 39 To set up a 3DC cascade configuration
1. Install and set up Cnt Ac-S and Cnt Ac-J on the required systems.
2. Create the Cnt Ac-S pair on the primary system. See the HP XP P9000 Continuous Access
Synchronous User Guide for instructions.
3. When Cnt Ac-S pair status is PAIR, create the Cnt Ac-J pair on the secondary system using the
Cnt Ac-S S-VOL as the Cnt Ac-J P-VOL. The Cnt Ac-J operation is rejected by the system if Cnt
Ac-S pair status is not already PAIR.
Mirror ID must be set between 1 and 3.
3DC multi-target configuration
In a multi-target configuration, data is copied from the local site to two remote sites.As illustrated
below, the P-VOL is paired with the Cnt Ac-S secondary volume (S-VOL) and the Cnt Ac-J S-VOL
at separate remote sites in a 3DC multi-target configuration. The Cnt Ac-S site is at an intermediate
distance; the Cnt Ac-J site is located at a greater distance.
Figure 22 3-data-center multi-target configuration
The host issues an update to the production volume and, synchronously, to the Cnt Ac-S S-VOL. As
with a standalone Cnt Ac-J system, the update data is asynchronously written from the primary
volume (P-VOL) to the Cnt Ac-J S-VOL.
The benefit of this configuration is that it provides a third copy of the data, helping to ensure that
business can continue in the event of a failure at the other two sites.
Failure recovery occurs as follows:
• If a failure occurs in the P-VOL, business is resumed using the Cnt Ac-S S-VOL. When the failure
is corrected at the primary site, business tasks are transferred back to the primary site.
In addition, a quick disaster recovery solution can be put in place while the primary site is
being restored, using a Cnt Ac-J pair for delta resync. In this configuration, the Cnt Ac-S S-VOL
3DC multi-target configuration 143
- 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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