User Manual

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Product Manual Technology Background
POrt
A port is the physical point of connection between the Vess and the iSCSI network. There are four ports on
each RAID controller for a total of eight. When you create a portal, you specify one or more ports. Each port has
a unique MAC address.
There are two options for each iSCSI port:
•
EnablePort–Turnstheportonoroff.
• JumboFrame–Enablesjumboframesupportontheport.
The standard Ethernet frame is 1518 bytes, with 1500 bytes for payload. A jumbo frame ranges from 1500
bytes to 9000 bytes of payload. Because jumbo frames carry more data, they are used to reduce network
management overhead, thereby increasing network throughput.
trunk
A trunk is an aggregation of two or more iSCSI ports on the same RAID controller. Also known as a link
aggregation. This feature combines ports to increase bandwidth.
Trunks are identied by their Trunk IDs.
When you create a trunk, you specify:
•
ControllerID–RAIDcontrollerwhoseiSCSIportsyouareusing.
• Masterport–AnyavailableiSCSIport.
• Slaveports–TheremainingavailableiSCSIports.
sessiOn
A session is a group of TCP connections that link an iSCSI initiator with a target. Each RAID controller supports
a maximum of 128 sessions.
•
Whentheserverreplies,theclientknowsthatthelinkisup(theconnectionbetweenclientandserver
works).
•
Ifthereisnoreply,theclientassumesthelinkisdownandroutesfuturedataoveranotherpathuntilthe
originallinkisupagain.