[5612] in linux-scsi channel archive
RE: Adaptec 2940UW and WDE9100
daemon@ATHENA.MIT.EDU (Marc SCHAEFER)
Fri Jan 15 13:40:25 1999
Date: Fri, 15 Jan 1999 19:31:28 +0100 (MET)
From: Marc SCHAEFER <schaefer@alphanet.ch>
To: Zygmunt Wiercioch <ZWiercio@JetForm.com>
cc: linux-scsi@vger.rutgers.edu
In-Reply-To: <311000B0752ED211B61700805F0D6B0904C5B7@OTTMAIL3>
On Fri, 15 Jan 1999, Zygmunt Wiercioch wrote:
> The drive did actually seem to disconnect at those times, one could hear a
> tick, as if the heads retracted and this was followed by the errors. The
> tar would keep going but the file system would be corrupted.
In my experience, this cannot come from bad cabling or bad termination.
This can be if the power supply is not enough. Can you try temporarily
with another power supply.
> I'll stick to the 5MB setting for now, but it would be nice to be able to
> run at 20.
(or 40 if it's wide)
Remember the SCSI specifications: each end of the bus must be actively
terminated. If only using one device on the WIDE connector of the Adaptec
(in or out), set termination to High/Low YES. Also you need to enable the
drive's terminator. Beware that some of the newest drives (especially the
LVD dual-mode models) don't have terminators and you need to terminate
externally (pass through active terminators for example)
Cable length is maximum 1.5 meter. Minimal distance between devices
is 30 cm.
However, I still think you have a power supply problem. Or maybe a
bad drive.
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