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Mirrorclone migration
XCS 10000000 and later controller software supports online mirrorclone migration, which allows
you to switch the identities (LUN WWNs), and thus the properties, of a source virtual disk with its
synchronized mirrorclone. The migration is accomplished without impacting presentations or host
I/O to the virtual disks. Data is not actually moved.
The online mirrorclone migration features are part of the HP P6000 Business Copy license.
Migrations can occur only if a valid instant-on or permanent HP P6000 Business Copy license is
present.
Thin provisioning
Thin provisioning is a feature of HP P6000 storage systems that allows you to create and manage
thin provisioned virtual disks. The maximum capacity of a thin provisioned virtual disk can differ
from its allocated capacity. When a thin provisioned virtual disk is created, the user specifies a
maximum capacity, and the reserved capacity is set to zero. As writes occur, disk space is
dynamically allocated, but reserved capacity and maximum capacity remain unchanged. The
space allocated does not need to be contiguous. In the event that the allocated capacity reaches
the physical disk capacity, the write operation fails.
EVA thin provisioned virtual disks also support unmap request (de-allocate or free the disk space)
sent by the host (VMware ESX 5.1x and Windows Server 2012). As unmap occur, disk space is
dynamically de-allocated, but reserved capacity and maximum capacity of the virtual disk remains
unchanged.
Thin provisioned virtual disks differ from standard virtual disks as follows:
Standard virtual diskThin provisioned disk
Requires the full amount of physical disk space to be
allocated at all times
The amount of physical disk space allocated can
automatically change in response to the amount of data
being stored, up to the specified size of the virtual disk or
until all available disk space is used
Must be explicitly resized whenever the amount of disk
space needs to be changed
Does not require explicit resizing (manually or with scripts)
Physical disk space that is allocated but unused can create
stranded capacity
Has no unused physical disk space
The requested capacity is limited by the amount of
available physical disk capacity that can be allocated
The maximum requested capacity can exceed the amount
of available physical disk capacity that can be allocated
The following example demonstrates thin provisioning:
A storage administrator is planning to create two virtual disks for two new host applications. His
HP P6000 storage system currently has a total capacity of 10 TB, with 6 TB unused disk space.
The administrator determines that each host application initially requires 2 TB of disk space, but
eventually, the host applications will require 4 TB of space. With these requirements in mind, the
administrator creates two 4 TB thin provisioned virtual disks.
Each host application recognizes a 4 TB virtual disk, even though initially only 2 TB of physical
disk space is allocated. As the amount of stored data increases, the storage system automatically
allocates more space (up to the 4 TB maximum size). And, even though only 6 TB of space is
available on the storage system, the administrator is able to add 2 virtual disks with a total potential
capacity of 8 TB.
Administrator can use email notifications (Thin provisioned Vdisk capacity alarms) to monitor
respective vdisk space allocations. This facility sends email notifications when the space allocation
goes beyond allocation alarm level or comes back to normal level. These events are also logged
in Controller Events.
34 Provisioning 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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