[Info-vax] PEA0: Errors

[norm.raphael at metso.com]

info-vax-bounces at rbnsn.com wrote on 03/05/2009 11:54:09 AM:

> In article <goour4$h6j$1 at south.jnrs.ja.net>, "Richard Brodie" <R.
> Brodie at rl.ac.uk> writes:
> >
> >"Christoph Gartmann" <gartmann at nonsense.immunbio.mpg.de> wrote in 
message 
> >news:gootg7$mej$1 at news.belwue.de...
> >
> >>   FCS Rx          : 0                  Drops Tx        : 2,654,260
> >>   Alignment Rx    : 0                Collisions Tx   : 117,101
> >>   Runts Rx        : 0                  Late Colln Tx   : 0
> >>   Giants Rx       : 0                  Excessive Colln : 0
> >
> >Those look clean enough, drops and collisions I would ignore. It's the
> >counters that are all 0 here I would worry about. Any of the other
> >cluster members showing significant numbers there, like the one(s)
> >the switch log calls out, for example?
> 
> The Alphas all show collisions and late collions where the boot node
> has the highest numbers (206 and 120). But the 3Com switch doesn't
> provide these numbers, so I don't know whether they are back to normal 
now.
> At least there are no more PEA0 errors since almost three hours.
> 
> >>  So I assume these "drops" are nothing to worry about.
> >
> >It just means that there are bursts of traffic that the switch port 
can't
> >forward. That's not unexpected where you have some 10Mbit/s
> >systems, although it does make them somewhat vulnerable to a
> >DoS attack (whether intentional or otherwise). 


We were experiencing drop/retry slowness on FTP transfers from a 100FD to 
a 
10HD system and were able to increase the number of buffers on the 10HD 
machine.
This really helped.  I don't know if you can do that for SCS traffic.

> 
> Ok, I understand.
> 
> Regards,
>    Christoph Gartmann
> 
> -- 
>  Max-Planck-Institut fuer      Phone   : +49-761-5108-464   Fax: -80464
>  Immunbiologie
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de
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