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BehaviorPoint in timeSetting
If cache data for a LUN exists on a partic-
ular controller, the unit will be brought
online there. Otherwise, the units are
brought online to Controller 2.
On dual boot or controller resynch
All LUNs are brought online to the surviv-
ing controller.
On controller failover
All LUNs remain on the surviving control-
ler. After controller restoration, the units
that are online to Controller 1 and set to
Path B are brought online to Controller 2.
This is a one-time occurrence. If the host
then moves the LUN using SCSI com-
mands, the LUN will remain where moved.
On controller failback
Changing virtual disk failover/failback setting
Changing the failover/failback setting of a virtual disk may impact which controller presents the disk.
Table 11 identifies the presentation behavior that results when the failover/failback setting for a virtual
disk is changed.
NOTE:
If the new setting moves the presentation of the virtual disk to a new controller, any snapshots or
snapclones associated with the virtual disk are also moved.
Table 11 Impact on virtual disk presentation when changing failover/failback setting
Impact on virtual disk presentationNew setting
None. The disk maintains its original presentation.No Preference
If the disk is currently presented on Controller 2, it is moved to
Controller 1. If the disk is on Controller 1, it remains there.
Path A Failover
If the disk is currently presented on Controller 1, it is moved to
Controller 2. If the disk is on Controller 2, it remains there.
Path B Failover
If the disk is currently presented on Controller 2, it is moved to
Controller 1. If the disk is on Controller 1, it remains there.
Path A Failover/Failback
If the disk is currently presented on Controller 1, it is moved to
Controller 2. If the disk is on Controller 2, it remains there.
Path B Failover/Failback
Implicit LUN transition
Implicit LUN transition automatically transfers management of a virtual disk to the array controller that
receives the most read requests for that virtual disk. This improves performance by reducing the
overhead incurred when servicing read I/Os on the non-managing controller. Implicit LUN transition
is enabled in VCS 4.x and all versions of XCS.
HP StorageWorks 4400 Enterprise Virtual Array user guide 39
- Array user guide 1
- Contents 3
- About this guide 11
- HP technical support 13
- Customer self repair 13
- Rack stability 13
- Subscription service 13
- HP websites 14
- Documentation feedback 14
- 1 EVA4400 hardware 15
- M6412 disk enclosures 16
- I/O modules 17
- I/O module status indicators 18
- Copper Fibre Channel cables 19
- Fibre Channel disk drives 20
- Controller enclosures 21
- Controller status indicators 24
- Power supplies 25
- Fan module 26
- Battery module 27
- HSV controller cabling 27
- Storage system racks 28
- Power distribution 28
- CXO5409B 29
- 4. AC receptacles1. PDU 1 30
- 5. Mounting hardware2. PDU 2 30
- 3. Circuit breakers 30
- EVA4400 hardware30 30
- Rack AC power distribution 31
- Moving and stabilizing a rack 33
- EVA4400 hardware34 34
- 1. Hex nut 35
- 2. Leveler foot 35
- EVA4400 hardware36 36
- 2 EVA4400 operation 37
- BehaviorPoint in timeSetting 38
- Implicit LUN transition 39
- EVA4400 operation40 40
- Starting the storage system 41
- EVA4400 operation42 42
- EVA4400 operation44 44
- Recovery firmware CD 46
- Handling fiber optic cables 46
- EVA4400 operation48 48
- 3 Replacing array components 49
- Replaceable parts 50
- Replacement instructions 52
- Replacing array components54 54
- 4 Single path implementation 55
- Recommended mitigations 56
- Supported configurations 56
- HP-UX configuration 58
- Limitations 59
- Requirements 60
- HBA configuration 60
- SUN Solaris configuration 63
- OpenVMS configuration 65
- NetWare configuration 66
- Linux (32-bit) configuration 67
- Linux (Itanium) configuration 69
- IBM AIX configuration 71
- VMware configuration 72
- Failure scenarios 74
- Sun Solaris 75
- Failure effectFault stimulus 76
- 5 Error messages 79
- Error messages92 92
- A Regulatory notices 93
- Class A equipment 94
- Class B equipment 94
- Modifications 94
- Laser device 95
- Notice for the European union 96
- Notice for France 96
- WEEE Recycling Notices 96
- Czechoslovakian notice 97
- Estonian notice 97
- Dutch notice 97
- Finnish notice 98
- French notice 98
- German notice 98
- Greek notice 99
- Hungarian notice 99
- Italian notice 99
- Latvian notice 99
- Lithuanian notice 100
- Polish notice 100
- Portuguese notice 100
- Slovakian notice 100
- Germany noise declaration 101
- Japanese notice 102
- Taiwanese notice 102
- Japanese power cord notice 102
- Regulatory notices104 104
- Internal component envelope 105
- EIA310-D standards 105
- Airflow and Recirculation 106
- Configuration Standards 107
- UPS Selection 107
- Glossary 109
- Glossary110 110
- Glossary112 112
- Glossary114 114
- Glossary116 116
- Glossary118 118
- Glossary120 120
- Glossary122 122
- Glossary124 124
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