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From: Wilko Bulte <wilko@yedi.iaf.nl>
Message-Id: <199512271919.UAA00953@yedi.iaf.nl>
Subject: Re: 4GB Seagate Barracuda (Hawk Replacement) goes nuts after a while
To: rgrimes@GndRsh.aac.dev.com (Rodney W. Grimes)
Date: Wed, 27 Dec 1995 20:19:27 +0100 (MET)
Cc: pete@RockyMountain.rahul.net, karl@mcs.com, Peter.Delaney@eng.sun.com,
        jbryant@argus.iadfw.net.gn.iaf.nl, fnf@amigalib.com,
        bardhan@corp.megatest.com, hackers@freefall.freebsd.org,
        freebsd-hackers@freebsd.org, karl@mcs.net
In-Reply-To: <199512270613.WAA22791@GndRsh.aac.dev.com> from "Rodney W. Grimes" at Dec 26, 95 10:13:55 pm
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> >     Seagate replaced the 4GB Hawk with a repaired 4GB Barracuda but
> > I seem to have a problem after Solaris 2.4 (without any patches) has
> > been running for a while but not doing anything. I suppose the
> > nfsd is scanning the disk once per night but other than that it's
> > wasn't doing much.
> 
> Nice of seagate to replace your drive with a faster one except that the
> Barracuda series is pretty much known as a lemon do to overheating
> problems and media that likes to flake :-(.
> 
> > 
> > It seems to get in a state where some SCSI reads are taking a few
> > seconds.
> 
> This is a good indication that a new error has developed and the drive
> goes to every possible measure to recover the data then it spends a bit
> more time doing an automatic bad sector allocation to map it out.  Most
> drives make a lot of noise during this operation as it is doing recalls
> and head offsets trying to recover the data.

It is worthwile to try what happens if you disable power-saving mode
in the drives mode pages. This has caused us quite some grief, because
it makes the disks unresponsive for some time. There are other side
effects that cause grief (and I cannot discuss them in public, so
don't ask)

Wilko
_     __________________________________________________________________________
 |   / o / /  _   Wilko Bulte             email: wilko@yedi.iaf.nl
 |/|/ / / /( (_)  Private FreeBSD site  - Arnhem - The Netherlands
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