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5 Performing pair operations
This chapter provides instructions for performing pair operations using Remote Web Console. Also
included is an operation for splitting pairs by consistency group, using RAID Manager.
Pair operations workflow
A typical workflow for performing pair operations consists of the following. You must have Storage
Administrator (Local Copy) role to perform Business Copy operations.
• “Check pair status ” (page 35). Each operation requires a pair to have a specific status. You
also check pair status to insure that an operation completed successfully.
• “Pair creation ” (page 35), in which the secondary volume becomes a duplicate of the primary
volume. With Business Copy, you have the option of creating a pair and immediately splitting
it in order to access the secondary volume.
• “Suspending pair creation” (page 41).
• “Pair split ” (page 42), which separates the primary and secondary volumes and allows use
of secondary volume data by secondary applications.
• “Running the consistency group pair-split ” (page 44), which allows you to split pairs in a
consistency group at a specified time.
• “Pair resynchronization” (page 44), in which the secondary volume is again updated from
the primary volume.
• “Pair deletion” (page 47) in which the pair relationship between the pair volumes is ended,
though the data remains.
Check pair status
Every pair operation requires the pair to have a specific status. When you want to perform a pair
operation, check pair status to insure that you can proceed successfully.
• For pair status definitions and instructions for finding pair status, see “Monitoring the system
” (page 49).
• You should also check whether an operation is possible given the status of related L1 and L2
pairs. For information, see “Status for L1, L2 pairs and operations permitted ” (page 51).
Pair creation
When you create the initial copy, data in the primary volume is copied to the secondary volume.
During the operation, the primary volume can receive updates from the host. After the initial copy
is completed, the updated data in the primary volume—differential data—is copied to the secondary
volume periodically (update copy).
Business Copy provides an option for creating the pair and immediately splitting it for instant access
to the secondary volume. Instructions are included in the procedure.
You can create cascaded pairs; instructions are included for L1 and L2 pairs.
Related information
• “Prerequisite information for creating pairs” (page 36)
• “Creating pairs” (page 38)
Pair operations workflow 35
- Abstract 1
- Contents 3
- 4 Contents 4
- Contents 5 5
- 6 Contents 6
- 1 Business Copy overview 7
- Cascaded pairs 8
- Remote Web Console GUI 9
- Initial copy 10
- Update copy 10
- 2 Requirements and planning 12
- License capacity requirements 13
- Planning pair volumes 13
- Planning number of pairs 14
- 16 Requirements and planning 16
- Planning for performance 18
- 20 Requirements and planning 20
- ◦ BC: PAIR or COPY(PD)/COPY 21
- Cache Residency 22
- Snapshot 22
- Data Retention 23
- ◦ Initializing the DP pool 24
- LUN Manager 25
- Open Volume Management 25
- Resource Partition 25
- Continuous Access Synchronous 25
- Continuous Access Journal 26
- External Storage 31
- Auto LUN 31
- Reserving secondary volumes 32
- 4. Click Finish 34
- 5 Performing pair operations 35
- 36 Performing pair operations 36
- Pair creation 37 37
- Pair creation 39 39
- 12. Click Next 40
- Pair split 42
- Pair resynchronization 44
- Pair resynchronization 45 45
- ◦ For L2 pairs 46
- Pair deletion 47
- Monitoring the system 49
- Monitoring synchronous rates 53
- Monitoring consistency groups 54
- Monitoring reserve volumes 54
- Maintaining the system 55
- 7 Troubleshooting 57
- 8 Support and other resources 66
- Typographic conventions 67
- (RWC) and RAID Manager 69
- B Business Copy GUI reference 71
- Summary tab 72
- Pairs tab 73
- Reserve Volumes tab 75
- Consistency Group tab 75
- View Pair Properties window 76
- Pair Properties tab 77
- Pairs table 77
- View Histories window 79
- Histories table 80
- Create Pair wizard 82
- Select Primary Volumes window 83
- Selected LDEVs table 84
- Available LDEVs table 86
- Confirm window 87
- Split Pairs wizard 88
- Selected Pairs table 89
- Resync Pairs wizard 91
- Suspend Pairs window 94
- Delete Pairs window 95
- Edit Mirror Units window 95
- Add Reserve Volumes Wizard 96
- Remove Reserve volume window 97
- Configuration workflow 100
- Reserving S-VOLs 100
- Reserving a consistency group 101
- Setting performance options 102
- Creating pairs 103
- Pair operations workflow 103
- Check pair status 103
- Suspending pair creation 108
- Resynchronizing pairs 109
- Deleting pairs 111
- 7. Click OK 113
- Pair Operation window 122
- Volume List 123
- Preview List 124
- Pair Operation command menu 125
- Display Filter dialog box 125
- History window 126
- Table 24 Reference Codes 127
- Option window 128
- Glossary 129
- 130 Glossary 130
- 132 Index 132
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