![background image](http://html2.mh-extra.com/html/quantum/snc-4500/snc-4500_user-manual_4004287113.webp)
SNC 450x User’s Guide
107
iSCSI Performance Tuning
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.
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.
Note
If the data path between the host and the SNC is not completely GbE but has
10/100 links, optimal performance cannot be obtained.
Summary of Contents for SNC 4500
Page 1: ...www adic com ADVANCED DIGITAL INFORMATION CORPORATION SNC 450xUser sGuide...
Page 6: ...vi Contents...
Page 20: ...14 Getting Started Figure 4 Scalar 100 with Four LTO 1 or SDLT Drives...
Page 23: ...SNC 450x User s Guide 17 Figure 6 Scalar 100 with Four LTO 2 Drives...
Page 30: ...24 Getting Started...
Page 46: ...40 Using the SNC Manager Interface...
Page 112: ...106 Removal and Replacement Procedures...
Page 116: ...110 iSCSI Performance Tuning...
Page 119: ...SNC 450x User s Guide 113 BSMI Notice...
Page 120: ...114 Regulatory Notices...