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5. You restore the suspended FS pair (“PSUS” status) (see “Workflow for restoring suspended
Fast Snap pairs” (page 81)).
The snapshot data is overwritten to the P-VOL. The FS pair status first changes to “RCPY” and
then the volumes are paired (“PAIR” status).
6. You complete one of the following while the volumes are paired (“PAIR” status):
• You exceed the pool capacity by reaching the total capacity of snapshot data in the pool.
NOTE: You can add data to the pool only up to the predetermined pool capacity limit.
Make sure you meet the pool capacity requirements (see “Fast Snap data pool
requirements” (page 30)).
• You restore the pair. A failure occurs and the pair is suspended (“PSUE” status).
• You reach the maximum pool usage rate (100%).
The FS pair is suspended (“PSUE” status).
The status of FS pairs depends on whether the hosts can read from or write to the FS pair P-VOL
or S-VOLs.
The following table explains the host access and pair status.
S-VOLP-VOLFS pair status
WriteReadWriteRead
NoNoYesYesSMPL(PD)
NoNoYesYesCOPY
NoNoYesYesPAIR/PFUL
YesYesYesYesPSUS/PFUS
NoNoYesYesRCPY
NoNoYesYesPSUE
Legend
Yes: Hosts can access the volume
No: Hosts cannot access the volume
CAUTION: If a host uses a software application to monitor FS pair volumes other than FS, the
S-VOL status determines if the software application ends abnormally. For example, if the S-VOLs
are in a status other than “PSUS” and “PFUS”, the host can reject access.
If a host connects to at least two ports, an abnormality can occur with ports that are not connected
to S-VOLs rejecting access from hosts. To resolve these issues, close the software application that
monitors volumes.
The copy threshold option and host server I/O performance
During the replication process, the host server I/O performance can decrease as the workload on
the XP7 storage system increases. Enable the copy threshold option to help minimize the decline
of host server I/O performance by lowering the workload on the storage system.
Related topics
• For more information about enabling the copy threshold option, contact HP Technical Support.
• HP XP7 for Compatible FlashCopy Mirroring User Guide.
The copy threshold option and host server I/O performance 17
- HP XP7 Fast Snap User Guide 1
- DescriptionDateEdition 2
- Contents 3
- 4 Contents 4
- Contents 5 5
- 6 Contents 6
- 1 Overview of Fast Snap 7
- Components of Fast Snap 8
- ◦ Thin Provisioning (THP) 9
- ◦ RAID Manager (RAID Manager) 9
- Components of Fast Snap pairs 9
- Fast Snap 10
- Thin Provisioning 10
- RAID Manager 10
- How Fast Snap works 11
- How Fast Snap works 13 13
- How snapshot data is stored 14
- Fast Snap pair status 15
- 16 Overview of Fast Snap 16
- Access Journal 23
- Ac-S/Cnt Ac-J P-VOL 24
- Resource Partition 26
- System requirements 27
- Shared memory requirements 28
- Changing shared memory 28
- Fast Snap volume requirements 29
- Snapshot group requirements 31
- Pool capacity calculations 35
- 3 Configuring Fast Snap 37
- Creating Fast Snap data pools 38
- Selecting pool volumes 40
- Changing LDEV settings 44
- 46 Configuring Fast Snap 46
- Confirming used LDEV IDs 47
- 48 Configuring Fast Snap 48
- 50 Configuring Fast Snap 50
- Creating LDEVs 51
- 54 Configuring Fast Snap 54
- 56 Configuring Fast Snap 56
- Changing CLPR numbers 60
- 4 Managing Fast Snap Pairs 61
- Creating Fast Snap pairs 64
- Creating Fast Snap pairs 65 65
- 66 Managing Fast Snap Pairs 66
- Creating Fast Snap pairs 67 67
- Creating Fast Snap pairs 69 69
- Complex Fast Snap pairs 70
- Creating Fast Snap pairs 71 71
- Snapshot data storage methods 73
- 74 Managing Fast Snap Pairs 74
- Restoring Fast Snap pairs 79
- Formatting external volumes 81
- 82 Managing Fast Snap Pairs 82
- Deleting Fast Snap pairs 85
- Prerequisites 86
- Releasing Fast Snap pairs 87
- Monitoring pair information 88
- Viewing LDEV properties 91
- Monitoring pair properties 98
- Monitoring synchronous rates 101
- Prerequisite 102
- Monitoring consistency groups 104
- Related topics 105
- Managing pools 110
- Monitoring pool information 111
- Management Status 115
- Managing pools 117 117
- Increasing pool capacity 118
- Managing pools 119 119
- ◦ The cache memory 120
- Managing pools 121 121
- Managing pools 125 125
- Editing pool names 126
- Managing pools 127 127
- Recovering blocked pools 128
- Managing pools 129 129
- Workflow for deleting pools 130
- Managing pools 131 131
- Managing virtual volumes 132
- Managing virtual volumes 133 133
- Deleting virtual volumes 135
- 6 Troubleshooting 138
- ◦ Delete unnecessary V-VOLs 139
- Automatic completion of SIMs 142
- Manually completing SIMs 142
- Confirming SIM completion 143
- 144 Troubleshooting 144
- 7 Support and other resources 145
- Typographic conventions 146
- Technical Support 150
- B Fast Snap GUI reference 157
- Replica LDEVs tab 158
- Local Replication window 159
- BC Pairs tab 160
- FS Pairs tab 163
- Consistency Groups tab 166
- Pairs table 168
- View Pair Properties window 169
- Pair Properties table 170
- Histories window 172
- FS Histories table 173
- ◦ Basic: Internal volume 173
- ◦ THP: THP V-VOL 173
- ◦ External: External volume 173
- Create Pools wizard 176
- Create Pairs wizard 176
- Select Primary Volumes window 177
- Available LDEVs table 178
- Selected LDEVs table 179
- Confirm window 182
- Select Pool window 183
- Split Pairs wizard 184
- Selected Pairs table 185
- Resync Pairs wizard 187
- Delete Pairs window 190
- Setting fields 192
- BC/FS System Options table 192
- DescriptionItem 194
- 194 Fast Snap GUI reference 194
- Glossary 195
- 196 Glossary 196
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