Promise Technology 2-Year Extended Warranty for VessR2000 RAID Head - Manual (Page 626)

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Product Manual Technology Background
P
Ort
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.
t
runk
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 identified 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.
s
essiOn
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.