Hp XP P9500 Storage User Manual Page 11
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Pair volumes
Original data is stored in the P-VOL and the remote copy is stored in the S-VOL. The pair can be
paired, split, re-synchronized, and returned to the unpaired (called “simplex”) state. When
synchronized, the volumes are paired; when split, new or changed data sent to the P-VOL is not
copied to the S-VOL. When re-synchronized, changed data is copied to the S-VOL. If a disaster
occurs, production operations can be transferred to the S-VOL. When the primary site is functional
again, operations can be transferred and data can be copied back to the P-VOL.
The P-VOL remains available to the host for read and write I/O operations. The secondary system
rejects write I/Os for the S-VOL, unless the write-enable option is specified. Then, write I/O is
allowed to the S-VOL while the pair is split. In this instance, S-VOL and P-VOL track maps keep
track of differential data and use it to re-synchronize the pair.
Journal volumes
For Continuous Access Journal operations, journal volumes are required on the primary and
secondary systems.
• Updates to the P-VOL are copied to the master journal volume in the primary system. See the
illustration in “Journals” (page 11).
• Master journal data is copied to the restore journal volume on the secondary system.
• Journal volumes can have different volume sizes and different RAID configurations.
• Journal data is stored sequentially and separately in each journal volume in the same journal.
For information on planning journal volumes, see “Sizing journal volumes ” (page 20) .
Journals
Journals help you manage data consistency between multiple P-VOLs and S-VOLs. A journal consists
of two or more data volumes and journal volumes.
You use journals to create multiple pairs and to split, resynchronize, and release multiple pairs.
Journals are required on the primary and secondary systems.
Each data volume and its associated journal volume reside in the same journal.
• The master journal contains master journal volumes and is associated with the P-VOL.
• The restore journal contains restore journal volumes and is associated with the S-VOL
Each pair relationship between journals is called a "mirror". A mirror ID identifies a pair relationship
between journals. When the pair is created, it is assigned a mirror ID.
Figure 3 Journals
Hardware and software components 11
- 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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