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example, when the P-VOL is a LUSE volume in which 1-GB, 2-GB, and 3-GB volumes are
combined in this order, the S-VOL must be a LUSE volume in which 1-GB, 2-GB, and 3-GB
volumes are combined in this order. In addition, RAID1, RAID5, and RAID6 can coexist in the
LUSE volume.
• Cnt Ac-J supports the Virtual LUN feature, which allows you to configure custom LUs that are
smaller than standard LUs. When custom LUs are assigned to a Cnt Ac-J pair, the S-VOL must
have the same capacity as the P-VOL. For details about Virtual LUN feature, see the HP XP
P9000 Provisioning for Open Systems User Guide.
• Identify the volumes that will become the P-VOLs and S-VOLs. Note the port, group ID (GID),
and LUN of each volume. This information is used during the initial copy operation.
• You can create multiple pairs at the same time. Review the prerequisites and steps in “Creating
the initial copy ” (page 54).
• When you create a Cnt Ac-J pair, you will have the option to create only the relationship,
without copying data from P-VOL to S-VOL. You can use this option only when data in the two
volumes is identical.
• When configuring the pair, best practice is to specify different serial numbers for the primary
and secondary systems.
Maximum number of pairs allowed
You can create up to 32,768 pairs on a P9500 system. The maximum number for your system is
limited by:
1. The number of cylinders in the volumes, which must be calculated.
2. The number of bitmap areas required for Continuous Access Journal data and journal volumes.
This is calculated using the number of cylinders.
CAUTION: The bitmap areas that are used for Continuous Access Journal are also used for
Continuous Access Journal Z, Continuous Access Synchronous, Continuous Access Synchronous
Z, and External Storage Access Manager. If you use Cnt Ac-J with any of these products, use the
total number of each pair’s bitmap areas to calculate the maximum number of pairs. In addition,
if Cnt Ac-J and Cnt Ac-S share the same volume, use the total number of both pairs regardless of
whether the shared volume is primary or secondary.
Calculating maximum number of pairs
NOTE: In the calculations below, note the following:
• ceil () indicates that the value between the parentheses should be rounded up to the nearest
integer.
• Number of logical blocks - Volume capacity (in bytes) / 512
To calculate the number of cylinders
Use the following formula:
umber of cylinders = (ceil ( (ceil (number of logical blocks / 512) ) /15) )
To calculate the number of required bitmap areas:
Use the following formula
ceil((number of cylinders x 15) / 122,752) )
where:
• number of cylinders x 15 indicates the number of slots
• 122,752 is the number of slots that a bitmap area can manage
Planning pair volumes 23
- 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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