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• The redundancy (Vraid) level of a snapclone can be any level relative to the source.
• Until a snapclone is normalized, another snapclone of the same source cannot be created.
Snapclones cannot be created when the disk to be replicated is:
• A snapshot
• A disk that has a snapshot or mirrorclone
• In the process of normalizing (snapclone in progress) or being deleted (P6000 Command
View 10.0 or earlier)
See also, “Optimizing snap creation” (page 41).
Snapshots
A snapshot is a dependent point-in-time copy of a virtual disk. It is dependent because data is not
actually copied to the snapshot until it is overwritten on the source. Use snapshots when you need
temporary copies; for example, to create a copy of a database that you then store on tape.
Snapshot types
Snapshot types are defined by how the storage system allocates space for the snapshot.
• Demand allocated—The storage system allocates only enough space to store metadata and
pointers to the source data. As the source is overwritten, the storage system allocates more
space and copies the original data to the snapshot. Use demand-allocated snapshots when
less than 10–25% of the capacity of the source will change over the life of the snapshot.
• Fully allocated—The storage system allocates only enough space to store metadata and pointers
to the source data, but reserves space equal to the capacity of the source virtual disk. As the
source is overwritten, the storage system allocates more space and copies the original data
to the snapshot. Use fully-allocated snapshots when more than 25% of the capacity of the
source will change over the life of the snapshot.
Snapshot guidelines
Follow these guidelines for using snapshots:
• The storage system must have a local replication license.
• The maximum number of snapshots per source varies based on the storage system controller
software version. For specifics, see the HP P6000 Enterprise Virtual Array Compatibility
Reference.
• A snapshot must be created in the same disk group as the source virtual disk.
• The redundancy (Vraid) level of a snapshot must be the same as, or lower than, the source.
• All snapshots of the same virtual disk must be the same type (demand allocated or fully
allocated) and redundancy (Vraid) level.
• If the disk group has insufficient space for demand-allocated snapshots, the snapshots will
automatically be invalidated, but the source virtual disks will continue accepting requests.
• Snapshots are included in the maximum number of virtual disks per storage system.
Snapshots cannot be created when the disk to be replicated is:
• A snapshot
• A disk that is the source of a mirrorclone (however, snapshots from a mirrorclone are possible)
• In the process of normalizing (snapclone in progress) or being deleted (P6000 Command
View 10.0 or earlier)
• See also, “Optimizing snap creation” (page 41).
HP P6000 Business Copy software 37
- User Guide 1
- Contents 3
- 4 Contents 4
- Contents 5 5
- 6 Contents 6
- 1 Overview 7
- 8 Overview 8
- 4. Browsing computer1. LAN 10
- 5. Hosts2. SAN 10
- 3. HP EVA4400 storage systems 10
- 10 Overview 10
- User interface 11
- Storage systems point of view 12
- Settings point of view 13
- 14 Overview 14
- Internet Protocol support 15
- Password formats 16
- Considerations 17
- License types 20
- Instant-on licenses 20
- Permanent licenses 20
- Data migration licenses 21
- FCIP licenses 21
- Obtaining license keys 22
- Retrieving licenses 23
- Entering license keys 23
- Importing licenses 24
- 4 Provisioning storage 26
- Disk types 27
- Disk group types 27
- General guidelines 27
- Disk group capacity 28
- Redundancy (Vraid) levels 29
- Virtual disks 30
- 32 Provisioning storage 32
- Presentation 33
- Online virtual disk migration 33
- Mirrorclone migration 34
- Thin provisioning 34
- Online Help 35
- 5 Replicating storage 36
- Snapshots 37
- Mirrorclones 38
- Containers 40
- Optimizing snap creation 41
- 42 Replicating storage 42
- DR groups 43
- Creating DR groups 44
- Initializing storage systems 46
- User-initiated service mode 47
- Starting the storage system 48
- Figure 10 HSV450 rear view 49
- Resynchronizing controllers 50
- Hardware 50
- Verifying hardware status 51
- Remote service test 51
- Configuring iSCSI devices 53
- Events overview 55
- Viewing events 56
- Viewing events 57 57
- Configuring host notification 58
- Filtering events by severity 59
- Retrieving the parse file 60
- Sending the event file 62
- Creating page footer messages 63
- Setting audit logging options 64
- Configuring SNMP credentials 66
- Optimizing performance 67
- Using the right-click menu 67
- Failed transceiver 70
- Failed I/O module 70
- Failed blower power supply 70
- Version numbers differ 72
- Performance Data Collector 74
- Events and logs 79
- Logging configuration file 79
- Configuration recommendations 80
- SSL protocol 81
- Prohibited commands 81
- Backward compatibility 81
- Using friendly names 82
- Using friendly names 83 83
- Using short names 84
- Viewing storage systems 85
- Specifying the output 85
- Filtering data 86
- Commands 87
- Command modifiers 89
- Data filtering 92
- Objects and counters 93
- HP EVA virtual disk 94
- HP EVA virtual disk group 95
- HP EVA host connection 96
- HP EVA host port statistics 96
- HP EVA physical disk 96
- HP EVA physical disk group 97
- HP EVA DR tunnels 97
- HP EVA DR Group Information 98
- HP EVA Xcopy Metrics 99
- HP EVA WSame Metrics 99
- HP EVA Unmap Metrics 100
- Contacting HP 101
- Related information 101
- Typographical conventions 102
- 12 Documentation feedback 103
- Event code format 104
- Corrective action codes 105
- Coupled crash control codes 106
- Dump/restart control codes 107
- Glossary 108
- 110 Glossary 110
- 112 Index 112
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