Unix administration - Re: Diagnosing network slowness: server or network?

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Author Re: Diagnosing network slowness: server or network?
Doug Freyburger

2005-06-24, 6:00 pm

sinister wrote:
> We have a Sun v1280 server, with users connecting via cheap Sun boxes over
> the ethernet.
>
> ftp to and from the v1280 is very slow.


Does it start slowly then the conversion goes fine until
any new port is opened, or is the slowness during the
file transfer? Slowness opening a new socket will be a
DNS issue most likely broken reverse tables. Slowness
once a large file transfer has started, double check
duplex settings on all host ans switch interfaces.

> How do I go about making a differential diagnosis between:
> * A network problem, not directly related to the v1280 itself;


Do stuff between the smaller boxes to tell this.

> * A networking problem, directly related to the v1280 (e.g., bad network
> card);


Logs viewed with dmesg and logs that appear in /var/ad/messages

> * A non-networking problem with the v1280


I mentioned the likely DNS issue above.

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