Hp StorageWorks Scalable File Share Bedienungsanleitung PDF herunterladen (Seite 158)

Verifying, diagnosing, and maintaining the system6–28

The output from the command consists of two columns of data: the first column lists the message size (in

bytes), and the second column lists the latency (in microseconds).

Unidirectional bandwidth test

Unidirectional bandwidth is a ping-ping test that measures the startup and throughput of a single message

sent between two processes, where outgoing messages are obstructed by incoming messages. Perform this

test by entering the gm_allsize command in slave/master mode as described earlier for the latency test,

with the following additional options:

On the slave server (south1 in this example), specify the --size=integer option when you invoke the

gm_allsize command. For example:

# ssh south1

# /opt/gm/bin/gm_allsize --slave --size=15

On the master server (south3 in this example), specify the --unidirectional, --bandwidth,

--size=integer, and --geometric options when you invoke the gm_allsize command. For

example:

# ssh south3

# /opt/gm/bin/gm_allsize --unidirectional

--bandwidth --remote-host=south1.my.domain.com --size=15

--geometric

You can also specify the --verify option to force the verification of the contents of all messages; however,

this option significantly degrades the performance of the test. You can obtain the host names by using the

gm_board_info program, as described earlier. The following example shows the output displayed at the

master server (south3 in this example). To stop the process on the slave server, press Ctrl/c:

# Opening board 0 port 2. Sending to port 2.

# Not verifying contents of messages.

Remote GM node id south1 (6).

# Reliable Point-To-Point Unidirectional Bandwidth (MByte/s)

# size 15

# /opt/gm/bin/./gm_allsize --unidirectional --bandwidth --remote-host=south1/

--size=15 --geometric

1 0.15

2 0.30

3 0.45

4 0.59

5 0.74

6 0.91

7 1.06

8 1.18

9 1.33

10 1.51

11 1.63

12 1.77

13 1.92

14 2.07

15 2.23

16 2.37

18 2.67

20 2.96

22 3.26

24 3.56

The output from the command consists of two columns of data: the first column lists the message size (in

bytes), and the second column lists the bandwidth (in MB/sec).

The following example shows the output displayed at the slave node, after you press Ctrl/c to stop the

process:

# Opening board 0 port 2. Sending to port 2.

# Not verifying contents of messages.

# Reliable Loopback Latency (usec)

# size 15

# /opt/gm/bin/./gm_allsize --slave --size=15

1 2 ... 153 154 155 156 157 158 159 160 161 162 163 ... 361 362

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