[8211] in linux-scsi channel archive
Re: my medium errors
daemon@ATHENA.MIT.EDU (Ralf Baechle)
Thu Feb 24 09:47:30 2000
Date: Thu, 24 Feb 2000 14:01:26 +0100
From: Ralf Baechle <ralf@uni-koblenz.de>
To: Admin Mailing Lists <mlist@intergrafix.net>
Cc: linux-scsi@vger.rutgers.edu
Message-ID: <20000224140126.A10490@uni-koblenz.de>
Mime-Version: 1.0
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In-Reply-To: <Pine.LNX.4.10.10002231002380.15173-100000@athena.intergrafix.net>
On Wed, Feb 23, 2000 at 10:10:47AM -0500, Admin Mailing Lists wrote:
> while we're on medium sense errors, I also have a problem.
>
> Chain 1. AIC7880 onboard (term.), 9G SCSI, Sony SDT-9000, Toshiba CD-ROM
> (term.)
> Chain 2. Adaptec Ultra2 controller, 18G SCSI
> linux, libc 5.4.38, kernel 2.2.10 SMP, bru 15.0
>
> A week ago I had my 18G drive go bad, grinding like anything, got it
> copied over to a new drive before the SCSI errors started.
> The DAY after I replaced it, the 9G drive does the same thing, got almost
> all of that copied over before the errors started.
> A few days after that, my tape drive is being odd..some days backing up
> fine, some days not at all, some days just a few gigs. The tape drive is
> about 2 years old..been thouroughly cleaned once.
>
> I see this from "dmesg"
> st0: Error with sense data: Current error st09:00: sense key Hardware
> Error
> Additional sense indicates Internal target failure
> st0: Error with sense data: Current error st09:00: sense key Medium Error
> Additional sense indicates Internal target failure
> st0: Error on write filemark.
> st0: Error with sense data: Current error st09:00: sense key Medium Error
> Additional sense indicates Internal target failure
A few years ago I we had repeated disk failures in one disk subsystem.
After replacing the disk for the second time within one or two months
we examined the power supply with a voltmeter which showed that 5V / 12V
were OK. After the third disk shotly after we again meassured the
voltage supplied, this time using a 500MHz digital scope. This time
we saw that the 5V did change betwen ~ 2.5V and close to 8V at times.
After replacing the powersupply the disk which previously indicated
media errors was working perfectly well again for the next few years.
Ralf
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