On Tue, 2011-03-29 at 05:13 +0800, mcclnx mcc wrote: > we have several servers on same rack and servers are all inside firewall. > Centos version from 4.X to 5.X. sometime the connection are very slow > (compare to servers on other racks also inside firewall). > > we discuss with network engineer he ask us use "ping" and traceroute" to > check. Both tools response time are good but if we connect through > application like Web browser, database, or DELL OPMN tool. The response time > is very very slow. > > This situation normally last 4 to 5 hours then it back to normal. Does there > has way to check "real" network response time so we can show to network > engineer. Otherwise they always say "no problem".
miitool and ethtool
Check that you're running at the right speed; sometimes bad cables will
make the negotiation go bad. Sometimes you just connect to the wrong
switch port. You may also note if the switch has hard-set values about
the negotiation such as duplex settings. Make sure they match on both
ends. You should be full duplex unless there's a very very good network
reason not to.
Lastly, check ifconfig output. Make sure there's no errors reported. If
you have a high error count, it's a good bet the cable is bad or the
sync settings are wrong.
--
Best Regards
Peter Larsen
Wise words of the day:
Showing up is 80% of life.
-- Woody Allen
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