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Monitoring snapshot space
Demand-allocated snapshots must be able to grow as the source or snapshot is modified, otherwise
all snapshots in the disk group become inoperative. As demand-allocated snapshots grow, the
capacity available to create virtual disks decreases. Before you allocate space for new virtual
disks, ensure that you reserve enough space for all demand-allocated snapshots in the disk group.
The capacity required for a demand-allocated snapshot depends on how much of the source disk
is modified. This value is unique for each application, but can range from 0% to 100% of the
source disk capacity. If you do not know the capacity required for a demand-allocated snapshot,
HP recommends that you reserve a minimum of 10% of the capacity of the source virtual disk times
the number of snapshots of the source disk. For example, if you have two demand-allocated
snapshots of a 500 GB virtual disk, you would reserve 100 GB (500 GB x 10% x 2) of usable
capacity. Compute the usable capacity using the redundancy (Vraid) level selected for the snapshot.
If the availability of demand-allocated snapshots is critical for application availability, overestimating
the requirements for free space may be warranted.
Always monitor free space. In addition to demand-allocated snapshots, a disk failure and the
subsequent reconstruction can also compete for free space. After a reconstruction, the reserved
space requirements for the disk protection level can cause existing snapshots to exceed available
free space and thus cause all snapshots to become inoperative.
Mirrorclones
Mirrorclone replication establishes and maintains a copy of an original virtual disk via a local
replication link.
When a mirrorclone contains exactly the same data as the source virtual disk, the mirrorclone is
said to be synchronized. In a synchronized state, the mirrorclone is automatically updated whenever
the source virtual disk is updated.
When local replication between a synchronized mirrorclone and its source is stopped by the user,
the mirrorclone is said to be fractured. In a fractured state, the mirrorclone is not updated when
the source virtual disk is updated. At the instant replication is stopped, the mirrorclone is a
point-in-time copy of its source. Although a fractured mirrorclone is no longer being replicated, it
maintains a relationship with its source virtual disk. This allows the mirrorclone to resynchronize
with its source without requiring a complete resynchronization.
When the relationship between a fractured mirrorclone and its source virtual disk is severed, the
mirrorclone is said to be detached. A detached mirrorclone is an independent virtual disk and
cannot be reattached to its parent virtual disk.
This feature is available only with certain controller software versions.
Mirrorclone guidelines
Follow these guidelines for using mirrorclones:
• The storage system must have a local replication license.
• A mirrorclone can be in a different disk group than the source. For optimum protection from
hardware failures, HP recommends creating a mirrorclone in a different disk group than the
source.
• A mirrorclone delta restore can be made when the mirrorclone source is also the source for
a DR group.
• The redundancy (Vraid) level of a mirrorclone can be the same, lower, or higher than the
source.
• The maximum number of mirrorclones per source is one.
• A detached mirrorclone cannot be reattached to its source. (You can remove a mirrorclone
from its source virtual disk, to make it an independent virtual disk. This action is called detaching
the mirrorclone.)
38 Replicating storage
- 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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