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Appendix G. ProtecTIER Network Performance Validation
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Utility for OpenStorage Systems
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© Copyright IBM Corp. 2008, 2010
The OpenStorage pt_net_perf_util utility's objective is to test network performance
between an OpenStorage host and a ProtecTIER server. This utility will not predict
backup and restore performance, but it may discover performance bottlenecks.
Before you begin
The requirements of this utility are as follows:
v Red Hat Enterprise Linux 5.4 or any other platform officially supported by the
OpenStorage plug-in
v Standard external utilities expected to be in the current path such as ping and
netstat
About this task
The pt_net_perf_util utility and the iperf tool it uses are installed as part of the
ProtecTIER software installation. The location of the utility varies according to the
platform:
v Windows plug-in: %PROGRAMFILES%\IBM\ost_plugin_tools
v AIX plug-in: /opt/IBM/ost_plugin_tools
v ProtecTIER server: /opp/dtc/app/sbin
This utility has two modes of operation, client and server. The server has to be
started before the client. Before running the utility, shut down all other programs
on both the client and server systems. The client is the system that transmits the
test data and the server is the system that receives the data (also known as the
target server). Based on the data sent by the client and received by the server, the
script outputs key network parameter values which indicate certain attributes of
the network. The goal of these tests is to benchmark the throughput of the
network. It is important to test both OpenStorage host-to-ProtecTIER server and
ProtecTIER server-to-OpenStorage host directions to measure the bandwidth
performance during both backup and restore activities. Network bandwidth is not
always the same in both directions. In addition, if an OpenStorage host or a
ProtecTIER server uses more than one IP address for OpenStorage operation, it is
essential to test each IP address separately.
In the following procedure, the goal is to test network performance between two
machines server1 and server2. Each test will run for five minutes. Since there are
five tests, the process will take a total of 25 minutes.
Procedure
1. Start the server mode of the utility on server1 by entering the following
commands on the command line:
./pt_net_perf_util -s
2. Start the client mode of the utility on server2 by entering the following
command on the command line:
./pt_net_perf_util -c server1_ip_address -t 300
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