HP StorageWorks 1510i Modular Smart Array iSCSI concepts and deployment guide (431338-002, July 2008)

many login keys that are negotiated in the Operational Parameters Negotiation stage of the
Login Phase are MaxRecvDataSegmentLength and FirstBurstLength. For example: key=value
MaxRecvDataSegmentLength=<numerical-value> MaxRecvDataSegmentLength defines the maximum
data segment length an initiator or target can receive in an iSCSI PDU (in bytes). key=value
FirstBurstLength=<numerical-value> FirstBurstLength defines the maximum amount of unsolicited data
the initiator can send to the target during the execution of a single SCSI command (in bytes).
NOTE:
For a complete list of iSCSI login keys, see RFC 3720 on the Internet Engineering Task Force website:
h
ttp://www.ietf.org/rfc/rfc3720.
iSCSI full-featured phase
After successfully completing the login phase on the first (leading) connection of the session, a session
is in full feature phase. In the full feature phase, the initiator sends SCSI commands and data to the
target by encapsulating them in iSCSI PDUs that go over the iSCSI session (transport). The initiator
receives SCSI responses embedded in iSCSI PDUs, from the target. SCSI I/O only occurs after the full
feature phase begins.
iSCSI network entities, portals, and nodes overview
Network Entity — a device or gateway that is accessible from the IP network. A network entity must have
one or more network portals. Each network portal can be used by one or more iSCSI nodes within that
network entity to gain access to the IP network.
Network Portal — a component of a network entity that has a TCP/IP network address and may be used
by an iSCSI node within that network entity for the connection(s) within one of its iSCSI sessions. A
network portal in an initiator is identifi ed by its IP address. A network portal in a target is identified by its
IP address and its listening TCP port.
iSCSI Node — a single iSCSI initiator or iSCSI target. There can be one or more iSCSI nodes within
a network entity.
The following image illustrates two iSCSI nodes (targets in this case) sharing network portals within
the same network entity.
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1510i Modular Smart Array iSCSI concepts and deployment guide
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