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StorNext File System Tuning
The Distributed LAN (Disk Proxy) Networks
StorNext File System Tuning Guide 22
It can be useful to use a tool like netperf to help verify the performance
characteristics of each Distributed LAN network. (When using netperf,
on a system with multiple NICs, take care to specify the right IP
addresses in order to ensure the network being tested is the one you will
be running Distributed LAN over. For example, if netperf -t TCP_RR
reports less than 15,000 transactions per second capacity, a performance
penalty might be incurred. Multiple copies of netperf can also be run in
parallel to determine the performance characteristics of multiple NICs.
Network Configuration
and Topology 0
For maximum throughput, SNFS distributed LAN can utilize multiple
NICs on both clients and servers. In order to take advantage of this
feature, each of the NICs on a given host must be on a different IP
subnetwork. (This is a requirement of TCP/IP routing, not of SNFS -
TCP/IP can't utilize multiple NICs on the same subnetwork.) An
example of this is shown in the following illustration.
Figure 1 Multi-NIC Hardware
and IP Configuration Diagram
Distributed
LAN
Client
C1
10.0.0.45
192.168.9.45
Distributed
LAN
Client
C1
10.0.0.44
192.168.9.44
Distributed
LAN
Server
S1
10.0.0.35
192.168.9.35
Distributed
LAN
Server
S1
10.0.0.34
192.168.9.34
Distributed
LAN
Client
C2
10.0.0.57
Distributed
LAN
Client
C2
10.0.0.56
Switch
A
10.0.0.x
Switch
B
192.168.9.x
Distributed
LAN
Server
S1
10.0.0.33
192.168.9.33
Distributed
LAN
Client
C1
10.0.0.43
192.168.9.43
Distributed
LAN
Client
C2
10.0.0.55
SAN