[6319] in linux-scsi channel archive
How do I fix an unreliable scsi Seagate HD and Adaptec SCSI controller?
daemon@ATHENA.MIT.EDU (Dr. Robert J. Meier)
Mon Apr 12 11:53:31 1999
From: "Dr. Robert J. Meier" <robert.meier@fanucrobotics.com>
To: "Linux-Scsi" <linux-scsi@vger.rutgers.edu>
Date: Mon, 12 Apr 1999 11:19:30 -0400
SCSI Linuxers,
Thank you for your time and any help you can offer.
What SCSI hard drive/host adapter combinations are people
using successfully?
Has anyone had experience (good or bad) with a Seagate SCSI
hard disk and Adaptec host adapter?
I had been watching this list for several months and in January
purchased a
9G Hard Disk Ultra Wide SCSI 2
Seagate Model: ST39173LW Rev: 6246
Type: Direct-Access ANSI SCSI revision: 02
Ultra Wide SCSI 2 Host Adapter
Adaptec AHA2940
Adaptec AHA274x/284x/294x (EISA/VLB/PCI-Fast SCSI) 5.1.10/3.2.4
It passed the smoke tests after installation, but after 6
weeks, I have traced chronic intermittent failures to unreliable
reads. I can duplicate the problem by simply reading the same
image (3000 copies of the same 300K file) multiple times.
A comparison (cmp(1)) of the copies fails 1-5 times per 3000.
The count of comparison failures is fairly steady, but the
particular comparisons that fail (0370, 1120, etc.) during each
set of 3000 is different.
I believe that the write operation is error free, but that
the read operation fails approximately once for every 100 MB
read.
I have switched the operating system from linux-2.2.1 to
linux-2.2.5. The problem also occurred under Windows95. I have
upgraded the support packages listed in the Changes file for
linux up to the latest available on the internet.
The only common piece that I see remaining is the read
amplifiers in the hard disk.
Is there something I'm missing?
Are there any suggestions?
Thank you,
Bob
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