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The maximum number of SS pairs supported on a system is the lowest value based on the following
calculations:
• The number of differential tables.
For more information about calculating based on differential tables, see “Calculating maximum
SS pairs based on differential tables workflow” (page 15).
• The shared memory capacity for the V-VOL management area.
For more information about calculating based on shared memory, see “Calculating maximum
SS pairs based on shared memory workflow” (page 16).
• Number of pair tables.
For more information about calculating based on pair tables, see “Calculating maximum pairs
based on pair tables” (page 19).
If you are creating external volumes or Fast Snap (FS), THP, or Smart V-VOLs in the storage system,
see “Calculating SS pairs when creating external volumes or V-VOLs” (page 15).
Calculating SS pairs when creating external volumes or V-VOLs
If you are creating external volumes or FS, THP, or Smart V-VOLs in the storage system, the maximum
number of SS pairs you can create is the lowest value based on the following calculations and no
more than 63,232 pairs:
• The value of the calculations for calculating the number of SS pairs.
For more information about calculating the number of SS pairs, see “Calculating the number
of Snapshot pairs” (page 14).
• Max. num. SS pairs = Num. of external volumes + Num. of FS, THP,
Smart, and SS V-VOLs
Calculating maximum SS pairs based on differential tables workflow
Differential tables keep track of the updates that take place in pairs. The number of these tables a
pair requires depends on the size of the volumes.
A base that does not have shared memory has 26,176 differential tables. The remaining number
of differential tables on a system is determined by the amount of shared memory that is installed
on your system. For more information about determining this amount, see “Determining maximum
pairs allowed on your system” (page 19).
When you use SS, the shared memory level is COW 1 with Extension 1 and Extension 2. The
following table shows the shared memory level combinations and the number of differential tables
that are associated with them.
Differential tables requiredCombination
26,176 tablesBase with no shared memory
104,768 tablesExtension 1
209,600 tablesExtension 2
The following software applications also use differential tables:
• BC/SS
• BC Z
• Compatible FlashCopy
• Auto LUN V2
Calculating the number of Snapshot pairs 15
- Abstract 1
- Contents 3
- 4 Contents 4
- Contents 5 5
- 6 Contents 6
- Snapshot software 7
- Data pools 8
- Components 9
- Licenses and capacity 9
- Consistency groups 9
- Pair status 10
- Planning pair volumes 13
- Sizing the data pool workflow 14
- 104,768 tablesExtension 1 15
- 209,600 tablesExtension 2 15
- T ÷ D = M 16
- 576,00 ÷ 4 = 14,400 16
- 751,619,276 bytesSS 17
- External volumes 22
- Configuration workflow 23
- Creating data pools 23
- Creating V-VOLs 24
- Creating V-VOLs 25 25
- Thin Provisioning 29
- Resource Partition 29
- Business Copy/Snapshot 29
- Auto LUN V2 33
- Fast Snap 34
- 5 Pair operations 35
- Configuring pairs 36
- Creating pairs 37
- 38 Pair operations 38
- Pair creation workflow 39 39
- Pair split 40
- Related topics 41
- Prerequisite information 41
- Pair deletion 42
- Monitoring the storage system 44
- Monitoring pair properties 45
- Monitoring synchronous rates 45
- Monitoring consistency groups 46
- Monitoring pool information 46
- Managing data pools 47
- Changing pool volume names 48
- Managing virtual volumes 49
- Changing virtual volume names 50
- Deleting virtual volumes 50
- General troubleshooting 52
- 8 Support and other resources 64
- Typographic conventions 65
- B Snapshot GUI reference 69
- Pools tab 70
- Selected pool volume window 72
- Summary table 73
- Pool Volumes tab 75
- Virtual Volumes tab 76
- Primary Volumes tab 78
- Create Pools wizard 79
- Setting items 80
- Selected pools table 82
- Expand Pool wizard 84
- Edit Pools wizard 86
- Edit Pools window 87
- Selected Pools table 89
- Delete Pools wizard 90
- Restore Pools window 92
- Complete SIMs window 93
- Select Pool Volumes window 95
- Available Pool Volumes table 96
- Selected Pool Volumes table 97
- Pool Property window 98
- Create Pairs wizard 99
- Select Primary Volumes window 100
- Available LDEVs table 101
- Selected LDEVs table 102
- Select Pool window 103
- Selected Pairs table 105
- Edit Mirror Units window 106
- Confirm window 106
- Pair operations workflow 108
- Checking pair status 108
- Creating a pair 108
- Splitting pairs 109
- Resynchronizing pairs 110
- Restoring pairs 110
- Deleting pairs 110
- Deleting pairs 111 111
- (secondary window) 112
- Pair status definitions 113
- Maintaining the system 117
- Pair Operation window 118
- Volume list 119
- Preview list 120
- Command menu 121
- History window 122
- Snapshot window 123
- Glossary 126
- 128 Index 128
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