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• All the P-VOLs, or S-VOLs, in a journal must belong to the same storage system.
• Journal numbers of master and restore journals that are paired can be different.
If using a consistency group number, the consistency group number of the P-VOL and S-VOL
must be the same.
• Each pair relationship in a journal is called a "mirror". Each pair is assigned a mirror ID. The
maximum number of mirror IDs is 4 (0 to 3) per system.
• When Cnt Ac-J and Cnt Ac-J Z are used in the same system, individual journals must be
dedicated either to one or the other, not both.
• Master and restore journals are managed according to the journal number.
• Review journal specifications in “System requirements” (page 15).
• A journal can contain up to 64 journal volumes.
Data transfer speed considerations
The previous topics and the topics later in this chapter on bandwidth discuss the amount of data
that must be stored temporarily in journals volumes and transferred over the data path network.
This topic discusses the speed that data must be transferred in order to maintain the Cnt Ac-J system
your are designing.
The ability of your Cnt Ac-J system to transfer data in a timely manner depends directly on the
following two factors:
• RAID group configuration
• Fibre-channel port configuration
Both of these elements must be planned to be able to handle the amount of data and number of
transactions your system will move under extreme conditions.
RAID group configuration
A RAID group can consist of physical volumes with a different number of revolutions, physical
volumes of different capacities, and physical volumes of different RAID configurations (for example,
RAID-1 and RAID-5). The data transfer speed of RAID groups is affected by physical volumes and
RAID configurations.
• The data transfer speed of a journal volume depends on the data transfer speed of the RAID
group to which it belongs. A RAID group can consist of one or more volumes, including journal
volumes.
• Each RAID group has a different throughput rating. The number of MB/sec that volumes in a
RAID group are capable of processing is published in Cnt Ac-J specifications.
• Journal volumes must be configured in RAID groups according to the group’s throughput
specification and your system’s peak write-workload. If write-workload exceeds the RAID
group’s throughput rating, then the number of RAID groups must be increased.
• Frequent read/write activity to non-journal volumes in a RAID group results in fewer read/writes
by journal volumes in the same RAID group. This can cause a drop in the data transfer speed
of journal volumes. To avoid this effect, place journal volumes and frequently accessed
non-journal volumes in different RAID groups.
Fibre-channel port configuration
The fibre-channel ports on your P9500 system have an IOPS threshold. Use the performance
monitoring information for the number of IOPS your production system generates to calculate the
number of fibre-channel ports the Cnt Ac-J system requires.
Data transfer speed considerations 21
- 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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