Quantum Marine Sanitation System 3.5.2 User Manual

Distributed LAN Server/Client Network and Memory Tuning

StorNext User’s Guide

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This may reduce the amount of packet loss. However, some Ethernet 

switches are unable to accommodate true GigE bandwidth, especially 

when multiple ports are transmitting data at the same time.

•

 For best performance and compatibility, 

update Intel e1000 drivers to the latest version.
In some cases, enabling TCP offload can cause issues. (Identify these 

issues by examining 

netstat -s

 output for bad segments.) If necessary, 

use 

ethtool -K

 to disable the offload of checksum calculations.

On some Linux 2.6 versions running on x86 64-bit systems, a console 

message regarding 

noirq handler

 may appear followed by a hard 

system hang. This is due to a bug in the kernel. To avoid this error, 

disable the 

irqbalance

 service.

•

 Introducing a slower server onto 

the network reduces overall throughput. This is because the slower 

server receives some traffic from all clients. For example, adding a 

server with one NIC in a network where other servers have two 

NICs, or adding a server with less disk bandwidth or a bad network 

connection, reduces throughput for the entire network.

1

The minimum amount of memory required for a Distributed LAN Server 

depends on the configuration.
•

 For a Windows Distributed LAN Server, use the following 

formula:
Required memory  = 1GB +

(# of file systems served
* # of NICs per Distributed LAN Client
* # of Distributed LAN Clients

On Linux, use 

ping

 and the 

cvadmin

 latency test tools to 

identify network connectivity or reliability problems. In 

addition, use the 

netperf

 tool to identify bandwidth 

limitations or problems.

On Windows, use the 

 tab of 

 to view network utilization.