Hp XP P9500 Storage User Manual Page 130
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Mirror IDs are assigned to each pair. You assign arbitrary numbers as mirror IDs. For example:
• Remote site1 mirror ID: M
• Remote site2 mirror ID: N
The host issues an update to the production volume and, as with a standalone Cnt Ac-J system, the
update data is asynchronously written from the primary volume (P-VOL) to the remote S-VOLs.
Related information
• “Failure recovery” (page 130)
• “Requirements, restrictions, and notes ” (page 130)
• “Problems that can occur with delta resync” (page 131)
• “Setting up the 3 Cnt Ac-J DC multi-target configuration” (page 131)
Failure recovery
In a 3DC multi-target configuration with three Cnt Ac-J sites, failure recovery proceeds as follows:
• If a failure occurs in the local site, business operations are moved to one of the remote sites.
When the failure is corrected at the local site, business operations are transferred back to the
local site.
• If a failure occurs between the local site and one of the remote sites, business operations are
moved to the pair volume on the healthy remote site. When the failure is corrected, business
operations are transferred back to the local site.
See “Recovery for 3 Cnt Ac-J DC multi-target configuration” (page 95) for recovery information
and procedures.
Requirements, restrictions, and notes
• The P9500 system at the three sites require registration of two mirrors in one journal (since
two pairs use the same volume). This is done using the Edit Journal Volumes dialog box in
Remote Web Console, and is discussed in the setup procedure.
Alternatively, if microprogram version 70-03-xx or higher is installed, you can use RAID
Manager to register the mirrors in the journal. Contact HP support to ensure that you have the
latest firmware version available.
• LUSE volumes cannot be used as pair volumes.
• To maintain consistency among the pairs in related journals, make sure that all data volumes
in the journals are used in pairs (with accompanying registered mirrors). If a data volume in
the local site journal, for example, is not used in a pair, the number of data volumes in the
journal may not be the same as the number in the secondary journal, and so consistency
cannot be maintained.
130 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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