Hp XP P9500 Storage User Manual Page 20
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- Table of contents
- TROUBLESHOOTING
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1. Using your performance monitoring software, collect the following:
• Disk-write bytes-per-second (MB/s) for every physical volume that will be replicated.
• Data should be collected over a 3 or 4-week period to cover a normal, full business cycle.
• Data should be collected at 5 minute intervals. If you use averages, shorter intervals
provide more accuracy.
2. At the end of the collection period, convert the data to MB/second, if needed, and import
into a spreadsheet tool.
Sizing journal volumes
You calculate the size of your journal volumes using write-workload and RPO.
To calculate journal size
1. Follow the instructions for “Measuring write-workload” (page 19).
2. Use your system’s peak write-workload and your organization’s RPO to calculate journal size.
For example:
RPO = 2 hours
Write-workload = 30 MB/sec
Calculate write-workload for the RPO. In the example, write-workload over a two-hour period
is calculated as follows:
30 MB/second x 60 seconds = 1800 MB/minute
1800 MB/minute x 60 minutes = 108,000 MB/hour
108000 MB/hour x 2 = 416,000 MB/2 hours
Basic journal volume size = 416,000 MB (416 GB)
Journal volume capacity and bandwidth size work together. Also, your strategy for protecting your
data may allow you to adjust bandwidth or the size of your journal volumes. For a discussion on
sizing strategies, see “Five sizing strategies ” (page 34).
NOTE: If you are planning for disaster recovery, the remote system must be large enough to
handle the production workload, and therefore, must be the same size as master journals. If not
planning a disaster recovery solution, remote journal volumes may be smaller than master journal
volumes.
Planning journals
Cnt Ac-J manages pair operations for data consistency through the use of journals. Cnt Ac-J journals
enable update sequence consistency to be maintained across a group of volumes.
Understanding the consistency requirements for an application (or group of applications) and their
volumes will indicate how to structure journals.
For example, databases are typically implemented in two sections. The bulk of the data is resident
in a central data store, while incoming transactions are written to logs that are subsequently applied
to the data store.
If the log volume “gets ahead” of the data store, it is possible that transactions could be lost at
recovery time. Therefore, to ensure a valid recovery image on a replication volume, it is important
that both the data store and logs are I/O consistent by placing them in the same journal.
The following information about journal volumes and journals will help you plan your journals.
• A journal consists of one or more journal volumes and associated data volumes.
• A journal can have only P-VOLs/master journals, or S-VOLs/restore journals.
• A journal cannot belong to more than one storage system (local or remote).
20 Planning volumes, P9500 systems
- 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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