Help needed!

[Doug Ledford]

Feng Peirong wrote:
> 
> Hi,
> 
> > check your termination.
> > check your cable.
> 
> Ya, the ST318436LW is connected without terminator and no jumper
> indicates
> terminator, I remove this disk temporarily. But the ST34501N has a
> jumper
> indicates the terminator, so I keep it. The two disks were connected
> using
> two individual cable, one 68pin and one a little wider 50pin cable.
> 
> But after removing the one without terminator ST318436LW, I copy a
> redhat
> ISO to sda1 and compute md5sum again. The problem remains.
>

You have a 7880 on board controller, one wide drive, one narrow drive and a
narrow CD-ROM.  That means that you should have both motherboard connectors in
use, the wide drive should be at the physical end of the wide cable, the wide
drive should have termination enabled.  The two narrow devices should be on
the same cable, preferably with the hard drive at the physical end of the
cable and the CD-ROM in the middle of the cable, with termination enabled on
the hard drive and termination disabled on the CD-ROM.  The motherboard should
likely be set to termination disabled or to Low Off/High On (depends on how
things are worded in the BIOS).

Finally, once all of this is done correctly, you should still make sure that
the overall length of both cables added together is less than 1.5 meters and
that the cables don't make any odd twists in order to get where they need to
go.  Standard SCSI cables will cause interferance with themselves if they have
twists and such.  You are usually far better off to have strong folds and
creases in the cable in order to avoid interferance.

When you get all of this done, if you still see data corruption issues, then
it's likely caused by bad RAM, bad cache, a bad CPU, or a motherboard that is
pushing your RAM faster than it should (and all of these were common problems
in the P-II 233 days).



> > what is your mother board ?
> 
> The mother board is P6LXI.
> 
> Need other information?
> 
> Peirong
> 
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-- 

 Doug Ledford <dledford at redhat.com>  http://people.redhat.com/dledford
      Please check my web site for aic7xxx updates/answers before
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