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than from the disk drives. Reading data from cache memory is faster than reading
data from a disk. The read cache is specified as either On or Off for each virtual
disk. The default state is on.
read ahead
caching
A cache management method used to decrease the subsystem response time to
a read request by allowing the controller to satisfy the request from the cache
memory rather than from the disk drives.
reconstruction The process of regenerating the contents of a failed member data. The
reconstruction process writes the data to a spare set disk and incorporates the
spare set disk into the mirrorset, striped mirrorset or RAID set from which the
failed member came.
redundancy 1. Element Redundancy—The degree to which logical or physical elements are
protected by having another element that can take over in case of failure.
For example, each loop of a device-side loop pair normally works independ-
ently but can take over for the other in case of failure.
2. Data Redundancy—The level to which user data is protected. Redundancy
is directly proportional to cost in terms of storage usage; the greater the
level of data protection, the more storage space is required.
redundant power
configuration
A capability of the Enterprise storage system racks and enclosures to allow
continuous system operation by preventing single points of power failure.
• For a rack, two AC power sources and two power conditioning units distribute
primary and redundant AC power to enclosure power supplies.
• For a controller or drive enclosure, two power supplies ensure that the DC
power is available even when there is a failure of one supply, one AC source,
or one power conditioning unit. Implementing the redundant power configur-
ation provides protection against the loss or corruption of data.
room temperature See ambient temperature.
SCSI 1. Small Computer System Interface. An American National Standards Institute
(ANSI) interface which defines the physical and electrical parameters of a
parallel I/O bus used to connect computers and a maximum of 16 bus ele-
ments.
2. The communication protocol used a controller pair and the hosts. Specifically,
the protocol is Fibre Channel drive enclosure or SCSI on Fibre Channel.
SCSI is the higher command-level protocol and Fibre Channel is the low-
level transmission protocol. The controllers have full support for SCSI-2; ad-
ditionally, they support some elements of SCSI-3.
SCSI-3 The ANSI standard that defines the operation and function of Fibre Channel
systems.
selective
presentation
The process whereby a controller presents a virtual disk only to the host computer
which is authorized access.
serial transmission A method of transmission in which each bit of information is sent sequentially
on a single channel rather than simultaneously as in parallel transmission.
SFP Small Form-factor Pluggable transceiver.
small computer
system interface
See SCSI.
Glossary120
- 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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