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Date:      Tue, 10 Aug 1999 23:27:42 +0200 (CEST)
From:      Soren Schmidt <sos@freebsd.dk>
To:        dwhite@resnet.uoregon.edu (Doug White)
Cc:        freebsd-current@FreeBSD.ORG
Subject:   Re: wd0: interrupt timeout (status 58<rdy,seekdone,drq> error  1<no_dam>)
Message-ID:  <199908102127.XAA55824@freebsd.dk>
In-Reply-To: <Pine.BSF.4.10.9908101237210.79312-100000@resnet.uoregon.edu> from Doug White at "Aug 10, 1999 12:38: 2 pm"

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It seems Doug White wrote:
> >  > 
> >  > > FWIW - I enabled APM over the weekend, configuring drives to
> >  > > spin down when not used for a good period of time. I get the
> >  > > message you list below, alternately with status 50 and 58, any
> >  > > time a drive needs to spin up.
> >  > 
> >  > 	Thanks for the response. FWIW I have no apm enabled and these
> >  > drives don't have a chance to spin down since they're always busy when
> >  > under load. 
> > 
> > Do those drives happen to be IBM DeskStar drives?
> > They spin down automatically when they have not been turned
> > off for about a week, in order to clean the heads.
> > It's a feature.
> 
> You've got to be kidding.  That makes them totally useless for server
> operation -- at some random time every week, down goes your server for a
> few minutes. :(

That can't be true, at least not for the IBM DeskStars I own, I've
NEVER EVER seen them do that, one proof should be:

11:22PM  up 105 days,  4:18, 1 user, load averages: 1.06, 0.94, 0.91

dmesg snippet:
wdc0: unit 0 (wd0): <IBM-DTTA-350840>, DMA, 32-bit, multi-block-16
wd0: 8063MB (16514064 sectors), 16383 cyls, 16 heads, 63 S/T, 512 B/S

And none of the other machines I have with semilar or newer IBM's
have ever done this, in fact I've yet to see one of them fail in
any way..

-Søren


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