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9 Disaster recovery operations
This chapter provides instructions for performing disaster recovery.
In addition to general recovery planning and procedures, detailed instructions are included for
recovery when Continuous Access Journal pairs are configured in 3-data-center (3DC) configurations
with three Cnt Ac-J sites, and with Continuous Access Synchronous/Cnt Ac-J sites. Recovery when
Cnt Ac-J pairs are shared with Business Copy pairs is also included.
Overview
Recovery is the reason for using Continuous Access Journal and other replication software. With
copies of data at a remote location, you restore lost or damaged information from the backup
copy. With copies in multiple remote locations, you increase the level of data security, with more
complex recovery procedures.
The following is covered in this chapter;
• “General recovery procedures” (page 91)
• “Recovery for 3 Cnt Ac-J data centers” (page 93)
• “Recovery for 3 Cnt Ac-J/Cnt Ac-S data centers and 3 Cnt Ac-J data centers” (page 97). This
includes information for both 3DC and 2DC configurations.
• “Recovery for configurations with Cnt Ac-J/Business Copy” (page 102)
General recovery procedures
A recovery workflow consists of the following:
1. “Preparing for recovery ” (page 91).
2. Establish file and database recovery procedures before disaster or failure occurs, as part of
the Cnt Ac-J planning process.
See “Preparing for file and database recovery ” (page 91).
3. After a disaster or failure, switch host operations to the secondary site.
See “Switching host operations to the secondary site ” (page 92).
4. Recover the primary site, then copy data to it from the secondary site.
See “Reversing copy direction from secondary to primary sites ” (page 92).
5. Re-establish the pair and host operations at the primary site.
See “Resuming host operations at the primary site ” (page 93).
Preparing for recovery
The major steps for preparing for disaster recovery are:
• Identify the data volumes that you want to back up for disaster recovery.
• Pair the important volumes using Continuous Access Journal.
• Establish file and database recovery procedures.
• Install and configure software for host failover between the primary and secondary sites.
Preparing for file and database recovery
File recovery procedures are necessary when the primary or secondary system suspends a pair
due to a disaster or failure. When this occurs, the S-VOL may contain in-process data resulting
from an open data set or transactions that could not complete. File recovery procedures in these
Overview 91
- 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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