Hp XP P9500 Storage Manuel d'utilisateur Page 22
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When you start the initial copy, you will specify whether to manage differential data by Tracks or
Cylinders. In Remote Web Console, you also have the Auto option. With Auto, either Cylinder or
Track is used, depending on the basic size of the LU.
• When creating a pair with RAID Manager, the Auto option is not available. If you do not
specify anything, Track is used.
• If VLL is used, the number of cylinders that you set with VLL software is used to determine the
Auto setting.
◦ If the P-VOL has 10,019 or more cylinders, Cylinder is set.
◦ If the volume has less than 10,019 cylinders, Track is set.
Maximum number of pairs supported
Continuous Access Synchronous supports a maximum of 32,768 pairs, which is the maximum
number of pairs supported by the P9500 storage system. If RAID Manager is used, a command
device must be defined. Therefore, the maximum number of pairs in the P9500 is 32,767.
When Continuous Access Journal and ESAM pairs exist in the same storage system as Continuous
Access Synchronous pairs, the total number of these pairs is the maximum number of pairs.
• The maximum number of pairs is determined by the number of LDEVs, not LUs.
• If a Continuous Access Synchronous pair or pairs include LUSE pairs, the maximum number
of pairs decreases, because a LUSE volume consists of multiple LDEVs.
Calculating maximum number of pairs
It is necessary to calculate the maximum number of pairs you can have on the P9500 storage
system. The maximum number is limited according to the following:
• The number of cylinders in the volumes:
The relationship between LDEVs in the storage system and the capacity for shared memory is
shown in the following table.
It must be calculated based on the following subsection, "To determine the number of cylinders"
Table 8 Shared memory and number of LDEVs
Total number of LDEVsAdditional shared memory for Continuous Access
Synchronous
16,384Base (16KLDEV, SI/VM)
65,28064K LDEV, SI / VM Extension1, FCV2, DP, Snapshot, TPF
• The number of cylinders in the volumes, which must be calculated.
• The number of bitmap areas required for Continuous Access Synchronous data. This must be
calculated using the number of cylinders.
◦ The bitmap areas that are used for Continuous Access Synchronous are shared with
Continuous Access Synchronous Z, Continuous Access Journal, Continuous Access Journal
Z, and External Storage Access Manager. If you also use these products, you must use
the total number of each pair’s bitmap areas to calculate the maximum number of pairs.
◦ If Continuous Access Synchronous and Continuous Access Journal share the same volume,
you must use the total number of bitmap areas for both pairs regardless of whether the
shared volume is primary or secondary.
To determine the number of cylinders
22 Planning for Continuous Access Synchronous
- Abstract 1
- Contents 3
- 4 Contents 4
- Contents 5 5
- Typical components 7
- Storage systems 7
- Volume pairs 8
- Data path 9
- Consistency groups 9
- Interfaces 14
- Failover software 14
- Initial copy 15
- Update copy 15
- System requirements 16
- Preparing P9500 systems 18
- Planning volume pairs 20
- Planning I/O to the S-VOL 21
- Managing differential data 21
- Synchronous 22
- 16,384Base (16KLDEV, SI/VM) 22
- Planning volume pairs 23 23
- Planning data paths 25
- 3 km4 Gbps 26
- 1.5 km8 Gbps 26
- Planning ports 27
- Planning consistency groups 28
- Host failover software 30
- Continuous Access Journal 32
- Business Copy 33
- LUN Expansion 35
- Virtual LVI/LUN 35
- Cache Residency 35
- LUN Manager 36
- Thin Provisioning 36
- Performance Monitor 36
- Auto LUN 37
- Data Retention 37
- Thin Provisioning Z 38
- Data Retention 39 39
- 5 Configuration operations 40
- 42 Configuration operations 42
- • When CU Free is selected 43
- 44 Configuration operations 44
- 48 Configuration operations 48
- 6 Pair operations 49
- 50 Pair operations 50
- Split pairs 51
- Resynchronize pairs 52
- Release pairs 53
- Change fence level 54
- 7 Monitoring and maintenance 55
- Pair status definitions 56
- Split and suspend types 57
- Export pair information 58
- Monitor copy operations, I/O 59
- Select data to be graphed 60
- Resize graph, save data 61
- Delete logical paths 62
- RCU maintenance 63
- General information 64
- Miscellaneous maintenance 65
- Media maintenance 66
- 8 Data migration 67
- Disaster recovery overview 68
- Analyze S-VOL currency 69
- 10 Troubleshooting 72
- Error codes and messages 76
- Pinned track recovery 83
- Contacting HP 84
- Related information 84
- Typographic conventions 85
- Pair Operation window 88
- Paircreate dialog box 93
- Pairsplit-r dialog box 94
- Pairresync dialog box 94
- Pairsplit-S dialog box 95
- Change Pair Option dialog box 95
- Display Filter dialog box 96
- RCU Operation window 97
- RCU Status dialog box 101
- Add RCU dialog box 103
- RCU Option dialog box 104
- Add Path dialog box 105
- Add SSID dialog box 105
- Usage Monitor window 106
- History window 107
- Export operations history 108
- History window notes 108
- System Option window 109
- Glossary 110
- 112 Index 112
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