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Date: Fri, 09 May 2003 12:27:08 -0700
From: Tim Kientzle <kientzle@acm.org>
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Subject: Re: Lockups with dump(8)
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Farid Hajji wrote

>   ad0: READ command timeout tag=0 serv=0 - resetting
>   ata0: resetting devices ..


I had a similar problem with a -STABLE system
that I tracked down to two problems:

   * Long 40-wire disk drive cable.
     Shorter or 80-wire cable is more reliable
   * Mis-jumpered hard disk.  I had the
     drive jumpered as "master _with_ slave",
     even though there was no slave on that
     cable.  Different hard disks handle this
     in different ways.

Once I fixed the jumpering and swapped in
a better hard disk cable, the problems went
away.

Tim Kientzle