Hp XP P9500 Storage User Manual Page 31
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• Install the Cnt Ac-J remote copy connections (cables, switches, and so on) between the primary
and secondary systems.
• When setting up data paths, distribute them between different storage clusters and switches
to provide maximum flexibility and availability. The remote paths between the primary and
secondary systems must be separate from the remote paths between the host and secondary
system.
System option modes
To provide greater flexibility, the P9500 has additional operational parameters called system
option modes (SOMs) that allow you to tailor the P9500 to your unique operating requirements.
The SOMs are set on the SVP by your HP representative.
The system option modes can be used for several kinds of Cnt Ac-J customizations, including:
• 2DC configuration
• Delta resync configuration
• Configuring split options for mirrors
• Improving initial copy time
The following table lists and describes the SOMs for Continuous Access Journal. For a complete
list of SOMs for the P9500, see the HP XP P9000 Owner Guide.
NOTE: The SOM information may have changed since this document was published. Contact
your HP representative for the latest SOM information.
Table 2 System option modes
DescriptionMode
When the SVP detects a blocked path:448
Mode 448 ON: An error is assumed and the mirror is immediately suspended.
Mode 448 OFF: If the path does not recover within a specified period of time, an error
is assumed and the mirror is suspended.
Note: Mode 448 setting is available only when mode 449 is set to OFF.
Mode 449 ON: The SVP does not detect blocked paths.449
Mode 449 OFF: The SVP detects blocked paths and monitors the time until the mirrors
are suspended.
It is strongly recommended that the path between the main and remote storage systems
have a minimum data transfer speed of 100 Mbps. If the data transfer speed falls to
466
10 Mbps or lower, Cnt Ac-J operations cannot be properly processed. As a result, many
retries occur and Cnt Ac-J pairs may be suspended. This SOM is provided to ensure
proper system operation for data transfer speeds of at least 10 Mbps.
ON: Data transfer speeds of 10 Mbps and higher are supported. The JNL read is
performed with 4-multiplexed read size of 256 KB.
OFF (default): For conventional operations. Data transfer speeds of 100 Mbps and
higher are supported. The JNL read is performed with 32-multiplexed read size of 1
MB by default.
Note: The data transfer speed can be changed using the Change JNL Group options.
With mode 474 set to ON, the initial copy time for a Cnt Ac-J pair is improved when
using the Cnt Ac-S initial copy operation.
474
The procedure requires use of a script, with the following operations:
• Cnt Ac-J initial copy operation, with "None" specified for the Initial Copy parameter.
• Split the Cnt Ac-J pair.
• Cnt Ac-S initial copy operation, using the split Cnt Ac-J pair volumes.
Guidelines for preparing systems for Cnt Ac-J 31
- 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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