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Date:      Mon, 28 Oct 1996 13:18:01 -0600 (CST)
From:      Joe Greco <jgreco@brasil.moneng.mei.com>
To:        rgrimes@GndRsh.aac.dev.com (Rodney W. Grimes)
Cc:        dufault@hda.hda.com, freebsd-scsi@freebsd.org
Subject:   Re: SCSI harddisk trouble: MEDIUM ERROR
Message-ID:  <199610281918.NAA16767@brasil.moneng.mei.com>
In-Reply-To: <199610281855.KAA19511@GndRsh.aac.dev.com> from "Rodney W. Grimes" at Oct 28, 96 10:55:05 am

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> > Do think this happens often? 
> 
> Almost certainly all of the reported ``why doesn't ARRE/AWRE'' handle this
> bad block are instances of this occuring, most likely a write operation that
> went haywire and undetected.
> 
> > Are there situations where
> > "write and verify" support would be worth the probable huge
> > performance hit?
> 
> It would be really nice to have a knob to turn it on and off via sysctl,
> Novell servers have had that knob since the 2.x days, Vax/VMS has had
> it for as long as I can remember, yes, I do think this would be worth it
> if we have a knob to twist.

I can not speak with anything close to Rod's level of expertise on this,
but I know I would feel more comfortable if we had a knob to twist too.
That does not mean I would use it by default, but there are applications
where you really are more interested in reliability than performance, and
in such circumstances I would use it.

Just an opinion,

... JG



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