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Verifying the system 6–21

6.1.8 Interconnect diagnostics

This section is organized as follows:

• Testing Gigabit Ethernet interconnect performance (Section 6.1.8.1)

• Examining the Myrinet interconnect (Section 6.1.8.2)

• Examining the Quadrics adapter and interconnect link (Section 6.1.8.3)

• Examining the Voltaire InfiniBand interconnect HCA adapter and interconnect link (Section 6.1.8.4)

6.1.8.1 Testing Gigabit Ethernet interconnect performance

This section describes how to test the performance of a Gigabit Ethernet interconnect. To run the tests

described in this section, the hpls-diags-client package must be installed on each of the client nodes

that will be used in the tests. This package is provided on the HP StorageWorks Scalable File Share Client

Software CD-ROM.

You can test the network performance of a Gigabit Ethernet interconnect by running the net_test.bash

command between multiple HP SFS servers and clients in three modes: sequential, parallel, and incremental.

Sequential tests determine whether any of the individual links between clients and Object Storage Servers

are running slowly. Parallel tests detect problems in the network at load, and incremental tests can verify the

results of the parallel tests. Run the sequential tests first, followed by the parallel tests, and finally run the

incremental tests.

To run the parallel or incremental tests, the client where you run the test must be able to connect to all of the

other clients that are to be used in testing, using either the ssh utility without a password or the rsh utility

without a password. If you are using the rsh utility, you must add --remote_shell rsh to the command

line.

Before you start to run the test scripts on the clients, ensure that the HP SFS servers are running the

appropriate network packet receivers, by entering the net_server.bash command on the administration

server, using the following syntax:

/usr/opt/hpls/diags/bin/net_server.bash --server "server_name1 [server_name2 ...]"

--net tcp

where the server_name arguments are the host names of the HP SFS servers that are to be tested. The

output from the command displays the TCP/IP address of each of the specified servers. You will use these

addresses as the arguments when you run the net_test.bash command on the clients.

Sequential test

NOTE: If you are performing the sequential test on a dual Gigabit Ethernet where client nodes have only a

single link, you must run the sequential test twice. The test must be run once from a client node that is

connected to one set of HP SFS server interfaces, and then run a second time from a client node that is

connected to the second set of HP SFS system interfaces.

If you are performing the sequential test on a bonded Gigabit Ethernet, the test will only give you the

performance of a single client. The test is therefore not representative of the potential throughput of the

servers. To get a proper representation of server throughput, perform the parallel test against each server in

turn with an even number of clients.

To run the net_test.bash command to test the connections to a number of servers sequentially, enter the

command on a client node, using the following syntax. Specify the TCP/IP address of each server to be

tested:

/usr/opt/hpls/diags/bin/net_test.bash --serial --net tcp --server "server_address1

[server_address2 ...]"

This command tests the network using the netperf tool. It tests the link to each server specified on the

command line, in sequence, from the client upon which the command is run.

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