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SCSI Target
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A SCSI Target is a storage system end-point that provides a
service of processing SCSI commands and I/O requests from an
initiator. A SCSI Target is created by the storage system's
administrator, and is identified by unique addressing methods. A
SCSI Target, once configured, consists of zero or more logical
units.
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SCSI Initiator
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A SCSI Initiator is an application or production system end-point
that is capable of initiating a SCSI session, sending SCSI commands
and I/O requests. SCSI Initiators are also identified by unique
addressing methods (See SCSI Targets).
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Logical Unit
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A Logical Unit is a term used to describe a component in a storage
system. Uniquely numbered, this creates what is referred to as a
Logical Unit Number, or LUN. A storage system, being highly
configurable, may contain many LUNS. These LUNs, when associated
with one or more SCSI Targets, forms a unique SCSI device, a device
that can be accessed by one or more SCSI Initiators.
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iSCSI
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Internet SCSI, a protocol for sharing SCSI based storage over IP
networks. The appliance supports the SCSI-3 Persistent Reservations
specification.
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iSER
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iSCSI Extension for RDMA, a protocol that maps the iSCSI protocol
over a network that provides RDMA services (i.e. InfiniBand). The
iSER protocol is transparently selected by the iSCSI subsystem,
based on the presence of correctly configured IB hardware. In the
CLI and BUI, all iSER-capable components (targets and initiators)
are managed as iSCSI components.
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FC
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Fibre Channel, a protocol for sharing SCSI based storage over a
storage area network (SAN), consisting of fiber-optic cables, FC
switches and HBAs. The appliance supports 4GB and 8GB Fibre Channel
Arbitrated Loop (FC-AL) topologies.
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SRP
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SCSI RDMA Protocol, a protocol for sharing SCSI based storage over
a network that provides RDMA services (i.e. InfiniBand).
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IQN
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An iSCSI qualified name, the unique identifier of a device in an
iSCSI network. iSCSI uses the form iqn.date.authority:uniqueid for
IQNs. For example, the appliance may use the IQN:
iqn.1986-03.com.sun:02:c7824a5b-f3ea-6038-c79d-ca443337d92c to
identify one of its iSCSI targets. This name shows that this is an
iSCSI device built by a company registered in March of 1986. The
naming authority is just the DNS name of the company reversed, in
this case, "com.sun". Everything following is a unique ID that Sun
uses to identify the target.
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Target portal
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When using the iSCSI protocol, the target portal refers to the
unique combination of an IP address and TCP port number by which an
initiator can contact a target.
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Target portal group
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When using the iSCSI protocol, a target portal group is a
collection of target portals. Target portal groups are managed
transparently; each network interface has a corresponding target
portal group with that interface's active addresses. Binding a
target to an interface advertises that iSCSI target using the portal
group associated with that interface.
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CHAP
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Challenge-handshake authentication protocol, a security protocol
which can authenticate a target to an initiator, an initiator to a
target, or both.
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RADIUS
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A system for using a centralized server to perform CHAP
authentication on behalf of storage nodes.
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Target group
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A set of targets. LUNs are exported over all the targets in one
specific target group.
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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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Target
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A storage system end-point that provides a service of processing
SCSI commands and I/O requests from an initiator. A target is
created by the storage system administrator, and is identified by
unique addressing methods. A target, once configured, consists of
zero or more logical units.
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Initiator
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An application or production system end-point that is capable of
initiating a SCSI session, sending SCSI commands and I/O requests.
Initiators are also identified by unique addressing methods.
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