COMSTAR Terminology
Review the following terminology before
configuring target devices with COMSTAR.
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Discovery
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The process that presents the initiator with a list of available targets.
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Discovery method
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The way in which the iSCSI targets can be found. Three methods are currently available:
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Internet Storage Name Service (iSNS) – Potential targets are discovered by interacting
with one or more iSNS servers.
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SendTargets – Potential targets are discovered by using a
discovery-address.
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Static – Static target addressing is configured.
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Initiator
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The driver that initiates SCSI requests to the iSCSI target.
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Initiator group
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A set of initiators. When an initiator group is associated with a LUN, only initiators from
that group may access the LUN.
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iqn or eui address format
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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
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A uniquely numbered component in a storage system. When a LUN is associated with one or more
SCSI targets, the target can be accessed by one or more SCSI initiators.
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Target device
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The iSCSI storage component.
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Target group
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A set of targets. A can be made available to all targets in one target group.
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Target portal group
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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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