Quantum 3.5.2 manual Distributed LAN Server Memory Tuning

Distributed LAN Server Memory Tuning

Distributed LAN Server/Client Network and Memory Tuning

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.

•Linux Network Drivers. 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 -soutput for bad segments.) If necessary, use ethtool -Kto 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.

•Mismatched Server Configuration. 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.

Note: 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 Networking tab of Windows Task

Manager to view network utilization.

The minimum amount of memory required for a Distributed LAN Server depends on the configuration.

•Windows. 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

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