Distributed LAN Server/Client Network and Memory Tuning

Distributed LAN Server/Client Network and Memory Tuning

Using the Distributed LAN Server and Client feature places significant additional demands on network capacity and system memory. Before creating and using a Distributed LAN Server and Client, review the following information:

Distributed LAN Server and Client Network Tuning

Distributed LAN Server Memory Tuning

Note: For additional information about Distributed LAN Client and server performance tuning, see the StorNext File System Tuning Guide.

Distributed LAN Server

Due to significant demands placed on the network, the following

and Client Network

network issues can occur when using Distributed LAN Servers and

Tuning

clients:

 

Configuring Dual NICs. If the Distributed LAN Server has two

 

 

network interface cards (NICs), each card must have a different

 

address and reside on a different subnet. In addition, to take

 

advantage of a second NIC in a Distributed LAN Server, the

 

Distributed LAN Clients must also have a second connected network

 

interface.

 

Dropped Packets. Some Ethernet switches may be unable to

 

accommodate the increased throughput demands required by the

 

Distributed LAN Server and client feature, and will drop packets.

 

This causes TCP retransmissions, resulting in a significant

 

performance loss. On Linux, this can be observed as an increase in the

 

Segments Retransmitted count in netstat -soutput during Distributed

 

LAN Client write operations and Distributed LAN Server read

 

operations.

 

To address this issue, edit the /usr/cvfs/config/dpserver configuration

 

file and reduce the Distributed LAN Server TCP window size from

 

the default value. (Remount the file system after making changes.)

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Quantum 6-01658-05 manual Distributed LAN Server/Client Network and Memory Tuning

6-01658-05 specifications

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