HP StorageWorks Modular Smart Array 1000 Installation and Reference Guide for - Page 45

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Glossary This glossary defines the terms used in this guide or related to this product. It is not a comprehensive glossary of computer terms. controller A hardware device that facilitates communication between a host and one or more LUNs organized as an array. DSM Device Specific Module fabric failover A network that contains high-speed fiber connections resulting from the interconnection of switches and devices. A fabric is an active and intelligent non-shared interconnect scheme for nodes. The automatic substitution of a functionally equivalent system component for a component that has failed. HBA Host Bus Adapter. An I/O device that serves as the interface connecting a host system to the SCSI bus or SAN (Storage Area Network) host The computer system on which the Multipath software is running. LUN Logical Unit Number. The actual unit number assigned to a device by the RAID system controller. mode MPIO A user-selectable parameter that specifies path behavior during normal and failure conditions. Paths can be set to one of the following modes: • Preferred - Indicates the path you choose for the desired I/O paths. When a path is in preferred mode, load balance is not enabled and the Load Balance Type displays as none. • Alternate - Indicates a path that is used for device access and I/O activities when the preferred path fails.. Multipathing Input/Output. path path state port A A virtual communication route that enables data and commands to pass between a host server and a storage device. An attribute that describes the operational condition of a path. A path can exist in one of the following states: • Active - Path is currently used for the I/O stream or is available for load balancing. • Available - Path is currently available, but not used for device access. The path is only in this state when no load balancing policy has been selected for the LUN. • Standby - Intermediate state of the path before it is initialized (made ready for device access), normally will not be seen. • Failed - Path is currently unusable for the I/O stream. The relative number of an HBA. A specific port number is determined according to its order of discovery by the Windows operating system. HBA's include SCSI, Fibre Channel, and IDE adapter types. SAN Storage Area Network. A configuration of networked devices for storage. HP MPIO Full Featured DSM for MSA1000/1500 (Active-Active) Disk Arrays 3.00.00 45

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Glossary
This glossary de
fi
nes the terms used in this guide or related to this product. It is not a comprehensive
glossary of computer terms.
controller
A hardware device that facilitates communication between a host and one
or more LUNs organized as an array.
DSM
Device Speci
fi
c Module
fabric
A network that contains high-speed
fi
ber connections resulting from the
interconnection of switches and devices. A fabric is an active and intelligent
non-shared interconnect scheme for nodes.
failover
The automatic substitution of a functionally equivalent system component for
a component that has failed.
HBA
Host Bus Adapter. An I/O device that serves as the interface connecting a host
system to the SCSI bus or SAN (Storage Area Network)
host
The computer system on which the Multipath software is running.
LUN
Logical Unit Number. The actual unit number assigned to a device by the RAID
system controller.
mode
A user-selectable parameter that speci
fi
es path behavior during normal and
failure conditions. Paths can be set to one of the following modes:
•
Preferred
— Indicates the path you choose for the desired I/O paths. When
a path is in preferred mode, load balance is not enabled and the Load
Balance Type displays as
none
.
•
Alternate
— Indicates a path that is used for device access and I/O activities
when the preferred path fails..
MPIO
Multipathing Input/Output.
path
A virtual communication route that enables data and commands to pass
between a host server and a storage device.
path state
An attribute that describes the operational condition of a path. A path can exist
in one of the following states:
•
Active
— Path is currently used for the I/O stream or is available for load
balancing.
•
Available
— Path is currently available, but not used for device access. The
path is only in this state when no load balancing policy has been selected
for the LUN.
•
Standby
— Intermediate state of the path before it is initialized (made ready
for device access), normally will not be seen.
•
Failed
— Path is currently unusable for the I/O stream.
port A
The relative number of an HBA. A speci
fi
c port number is determined according
to its order of discovery by the Windows operating system. HBA’s include SCSI,
Fibre Channel, and IDE adapter types.
SAN
Storage Area Network. A con
fi
guration of networked devices for storage.
HP MPIO Full Featured DSM for MSA1000/1500 (Active-Active) Disk Arrays 3.00.00
45