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The SNC 450x is intended to be operated in a Gigabit Ethernet (GbE) LAN switching environment without
passing traffic through a router, gateway or WAN connection. As a result, CRCs at the Ethernet and TCP
levels are not intentionally modified, and the possibility of errors injected and included in the CRC calculation
is avoided. In this situation, the 32-bit CRC provided by Ethernet protects effectively against undetected
errors generated within the fabric.
iSCSI performance depends on several factors, but in general the performance depends on the network
speed and Ethernet processing performance of the host and target device.
iSCSI performance depends on several factors:
•
Network speed and processing
•
Host Ethernet software configuration
Network Speed and Processing
The faster the network, the higher the performance. Gigabit Ethernet (GbE) is currently the fastest network
speed available for iSCSI. To implement a GbE network, three things are required: GbE host bus adapters
(HBAs) in the computers accessing the target devices, GbE network switches, and GbE cabling.
If the data path between the host and the SNC is not completely GbE but has
Note
10/100 links, optimal performance cannot be obtained.
GbE HBAs
GbE-capable host bus adapters come in the following types:
•
Standard Ethernet board
•
TCP/IP checksum offload on board
•
iSCSI protocol on board
A standard GbE HBA transmits and receives data at Gigabit speed, which is 10 times faster than the current
100 Base-T (100 Megabits/s) networks. The 100 Base-T is 10 times faster than the older 10 Base-T (10
Megabits/s) networks. The faster the speed of the network, the higher the performance of the network.
SNC 450x User's Guide
iSCSI Performance Tuning
107
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