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A 3 Cnt Ac-J data-center configurations
With Continuous Access Journal, a volume at the primary site can be backed up to second and
third remote Cnt Ac-J sites in 3 data center (3DC) configurations.
This appendix provides planning and setup information for 3-Continuous Access Journal data
center configurations.
Overview
You can configure a Continuous Access Journal system using multiple P9500s in the following
configurations for disaster recovery:
• 3-data center cascade (3DC cascade). Data in the Cnt Ac-J P-VOL is paired with an S-VOL in
the Cnt Ac-J intermediate site; and then the intermediate site S-VOL is paired (becoming a
P-VOL) with an S-VOL in the Cnt Ac-J remote site. See the figure and information in “3 Cnt
Ac-J DC cascade configuration” (page 126).
• 3-data center multi-target configuration (3DC multi-target). Data in the Cnt Ac-J P-VOL is paired
with two S-VOLs—in two remote Cnt Ac-J locations. See the figure and information in “3 Cnt
Ac-J DC multi-target configuration” (page 129)
• An additional option for cascade and multi-target configurations is the delta resync, which
pairs the local P-VOL and one of the remote S-VOLs. The delta resync provides one more
option for maintaining a close copy of production data for use as a backup in the event of
failure at the other sites. The delta resync is slightly different for the cascading and mu lti-target
configurations. See the following sections for details.
• 3DC configurations can be set up using Continuous Access Synchronous and Cnt Ac-J also.
See “Sharing volumes with Continuous Access Synchronous” (page 141) for information.
3 Cnt Ac-J DC cascade configuration
In a multi-target configuration, data is copied from the local site to two remote sites.In a cascading
configuration, data is copied from the primary (local) site to an intermediate site and then to a
remote site.
The intermediate site volume acts as:
• The S-VOL for the local-intermediate pair
• The P-VOL for with the intermediate-remote pair
In addition, you can create a delta resync pair from the local site to the remote site. Once created,
the delta resync pair remains split unless the S-VOL is needed for disaster recovery. Though the
pair is split, the S-VOL contains all but the latest production differential data. This is because the
volume is also the S-VOL for the pair from the intermediate site and so is updated regularly.
126 3 Cnt Ac-J data-center configurations
- 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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