Hp XP P9500 Storage User Manual Page 32
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1,048,575 - 15,000 - 30,000 = 1,003,575
The results of the calculation shows that you can create up to 1,003,575 FS pairs.
An FS pair consists of a P-VOL and up to 1,024 V-VOLs. Differential tables are used per P-VOL.
The number of differential tables you can you use does not depend on the number of V-VOLs.
Calculating the number of Fast Snap pairs based on the snapshot estimated manageable capacity
You can view the snapshot estimated manageable capacity in the Local Replications window.
To calculate the number of FS pairs that you can create based on the snapshot estimated
manageable capacity, use the following formula:
The number of snapshot estimated manageable capacity / the snapshot
manageable capacity per P-VOL
The snapshot manageable capacity per P-VOL = (the P-VOL capacity of FS
pairs [TB] / 2.6 [TB]) * 3,024 [GB] + (168GB * 2 (consumed shared
memory))
Calculating the number of Fast Snap pairs based on the number of cache management devices
You can view the number of cache management devices in the View Management Resource Usage
window.
To calculate the number of FS pairs that you can create based on the number of cache management
devices, use the following formula:
The number of FS pairs that you can create = the number of cache
management devices / ceil (the P-VOL capacity of FS pairs [TB]) / 2.6
[TB])
Related topics
• (page 32).
Calculating the number of cache management devices
Cache management devices are the unit for controlling the cache in association with volumes
(LDEVs). Each volume requires a minimum of one cache management device. You can manage
up to 65,280 cache management devices in a system. You can view the number of cache
management devices in the View Management Resource Usage window.
This section explains the number of cache management devices that are required for FS tasks.
For more information about LDEVs and the cache management devices that are required for THP
volumes, see the HP XP P9000 Provisioning for Open Systems User Guide.
Fast Snap cache management device requirements
To create FS pools for the first time, you must have a total of 8,192 cache management devices
available. FS assigns 4,096 cache management devices from the amount available.
To create an FS pair for a volume for the first time, you must have at least 4,097 cache management
devices available. Otherwise, pair creation can fail. Use the following formula to calculate the
number of cache management devices you will need to create pairs.
Use the following formula when you create an FS pair for a volume for the first time:
ceil(Size of P-VOL ÷ 2.6) (in terabytes)
If the amount of pool usage for the P-VOL exceeds 70% of the total capacity of the cache
management devices reserved for the P-VOL, another cache management device must be reserved.
Each P-VOL requires up to 256 cache management devices.
32 Planning and design
- Abstract 1
- DescriptionDateEdition 2
- Contents 3
- 4 Contents 4
- Contents 5 5
- 1 Overview of Fast Snap 6
- Components of Fast Snap 7
- Components of volumes 8
- Consistency groups 8
- Snapshot groups 8
- Fast Snap 8
- How Fast Snap works 9
- Fast Snap pairs 10
- How Fast Snap works 11 11
- Snapshot data storage methods 12
- CAW storage method workflow 13
- COW storage method workflow 13
- Pair status 14
- Pair status 15 15
- Copy threshold option 16
- Data Retention 18
- Auto LUN 19
- Business Copy 19
- BC P-VOL 20
- Thin Provisioning 24
- Resource Partition 25
- 2 Planning and design 26
- Removing shared memory 27
- Fast Snap volume requirements 27
- Notes on consistency groups 30
- 104,768Extension 1 31
- 209,600Extension 2 31
- 32 Planning and design 32
- Calculating pool capacity 33
- 34 Planning and design 34
- Configuration tasks workflow 35
- Pool volumes with system area 35
- Creating Fast Snap data pools 36
- Creating V-VOLs 37
- Related topics 39
- Editing the V-VOL SSID 39
- Changing the V-VOL settings 40
- 4 Pair tasks 41
- Configuring a complex pair 43
- Splitting pairs 44
- 46 Pair tasks 46
- Restoring pairs 48
- Deleting snapshot data 49
- Deleting FS pairs 49
- 5 Monitoring and maintenance 51
- Monitoring synchronous rates 52
- Monitoring consistency groups 53
- Monitoring licensed capacity 57
- Managing pools and V-VOLs 57
- Increasing pool capacity 58
- Changing pool threshold 59
- Changing pool names 59
- Recovering pools 60
- Deleting pools 61
- Changing V-VOL names 61
- Maintenance requirements 62
- Maintenance requirements 63 63
- 6 Troubleshooting 64
- Completing SIMs 67
- 68 Troubleshooting 68
- 7 Support and other resources 69
- Typographic conventions 70
- Typographic conventions 71 71
- Support 74
- B9AD, B9AE) 74
- B Fast Snap GUI reference 80
- Local Replications window 81
- Summary tab 82
- Pairs tab 83
- Reserve Volumes tab 85
- Consistency Groups tab 86
- View Pair Properties window 87
- Pairs table 88
- View Histories window 90
- Create Pair wizard 93
- Create Pair window 94
- Select Primary Volumes window 95
- Selected LDEVs table 96
- Select Pool window 97
- Available Pools table 98
- Available LDEVs table 99
- Confirm window 101
- Split Pairs wizard 102
- Resync Pairs wizard 105
- Resync pairs window 106
- Delete Pairs window 109
- Selected Pairs table 110
- BC/FS/SS System Options table 111
- System Type: Mainframe 111
- Glossary 114
- 116 index 116
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