HP StorageWorks Scalable File Share - Manual (Page 158)

Verifying, diagnosing, and maintaining the system 6–28
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