[CentOS] centos server network speed check???

[mcclnx mcc]

I don't think it is cable problem.  The reason are:

1. it happen every 3 to 4 weeks once.

2. problem last 4 to 5 hours then back to normal.

3. not one server has this problem, several servers on that rack all have problem at same time.



--- 11/3/28 (一)，Peter Larsen <plarsen at famlarsen.homelinux.com> 寫道：

> 寄件者: Peter Larsen <plarsen at famlarsen.homelinux.com>
> 主旨: Re: [CentOS] centos server network speed check???
> 收件者: centos at centos.org
> 日期: 2011年3月28日,一,下午5:41
> 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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