Hp XP P9500 Storage User Manual Page 93
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Data in the secondary site is now reflected on the primary site.
Resuming host operations at the primary site
When Cnt Ac-J pairs are established in the reverse direction between the secondary and primary
sites, you can return host operations to the original configuration. This means resuming host
operations at the primary site and reestablishing the original flow of data from primary to secondary
systems. The following procedure explains how to resume normal operations at the primary site.
1. At both sites, make sure that Cnt Ac-J components are operational.
2. Make sure that pair status of P-VOLs and S-VOLs in all Cnt Ac-J pairs is PAIR.
3. Stop host applications at the secondary site.
4. Issue a request for splitting pairs to master journals (these were originally the restore journals
on the remote site); use the Flush option when splitting pairs. If an error occurs when splitting
pairs, fix the error, resume host operations at the secondary site, and then go back to step 1.
5. If no errors occur, wait until suspension finishes. After suspension finishes, check for an S-VOL
on the local site whose status is not PSUS. If such a pair exists, fix the error and go back to
step 1 after resuming your business task at the secondary site.
6. When all S-VOLs at the primary site are in PSUS status, data in P-VOLs and S-VOLs are the
same. S-VOLs at the primary site are ready for host read/write activity. Resume applications
at the primary site.
7. Run the pairresync -swaps command, which reverses P-VOLs and S-VOLs and resynchronizes
the pairs. The replication is from the primary site to the secondary site (disaster recovery site).
NOTE: When you run the pairresync -swaps command, you can use the -d option to specify
a data volume. However, the command is rejected if the restore journal where the data volume
belongs is in Active, Halting or Stopping status.
Recovery for 3 Cnt Ac-J data centers
Cnt Ac-J copies in two remote sites provides better backup protection, but recovery is somewhat
more complex. The following topics provide instruction for resuming host operations at a backup
site and then restoring the original system and configurations.
Recovery operations for 3 Cnt Ac-J data centers depends on your configuration.
• “Recovery for 3 Cnt Ac-J DC cascade configuration” (page 93)
• “Recovery for 3 Cnt Ac-J DC multi-target configuration” (page 95)
• “Recovery when the primary-intermediate path fails” (page 95)
Use RAID Manager for all procedures.
Recovery for 3 Cnt Ac-J DC cascade configuration
For recovery instructions, see the following:
• “Recovery when the primary site fails” (page 93).
• “Recovery when the intermediate site fails” (page 94)
For remote site failure, business operations are not effected since the primary and intermediate
sites are still operable. Recover the remote site then set up the cascade pairs again.
Recovery when the primary site fails
Recovery operations consist of the following when a failure occurs in the primary site:
• Transfer host operations to the intermediate site.
• Restore the primary site failure and restart business operations.
Recovery for 3 Cnt Ac-J data centers 93
- 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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