Hp XP P9500 Storage User Manual download pdf (Page 12)

Snapshot data storage methods

You can use the Copy-On-Write (COW) method or the Copy-After-Write (CAW) method to store

snapshot data. In the COW method, when the P-VOL snapshot data is acquired, the status changes

to the write completion status. In the CAW method, when the P-VOL snapshot data is written, the

status changes to the write completion status. The CAW method wait time is shorter than that of

the COW method.

The following figure illustrates the CAW method.

The following figure illustrates the COW methods.

12 Overview of Fast Snap

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 115 116

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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