iSCSI Terminology
Review the following terminology before configuring iSCSI targets and
initiators.
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Discovery
| The process that presents the initiator with a list of available targets.
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Discovery method
| The way in which the iSCSI targets can be found. Three methods are currently
available: Internet Storage Name Service (iSNS) – Potential targets
are discovered by interacting with one or more iSNS servers.
SendTargets – Potential targets are discovered by using
a discovery-address.
Static – Static target addressing is configured.
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Initiator
| The driver that initiates SCSI requests to the iSCSI target.
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Initiator group
| A set of initiators. When an initiator group is associated with a LU,
only initiators from that group may access the LU.
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iqn or eui address format
| An iqn (iSCSI qualified name) address is the unique
identifier for a device in an iSCSI network using the form iqn.date.authority:uniqueid. An iSCSI initiator or target is assigned an IQN name automatically
when the iSCSI initiator or target is initialized. An eui (extended unique identifier) address consists
of 16 hexadecimal digits, and identifies a class of GUIDs that is used in
both the SCSI and InfiniBand standards. SRP devices use the eui address
format.
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Logical unit (LU)
| A uniquely numbered component in a storage system. When a LU is associated
with one or more SCSI targets, the target can be accessed by one or more SCSI
initiators. A logical unit is identified by a logical unit number (LUN).
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Target device
| The iSCSI storage component.
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Target group
| A set of targets. A LU can be made available to all targets in one target
group.
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Target portal group
| A list of IP addresses that determines which interfaces a specific iSCSI
target will listen to. A TPG contains IP addresses and TCP port numbers.
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