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Date:      Fri, 29 May 1998 12:30:29 +0200
From:      Eivind Eklund <eivind@yes.no>
To:        tcobb <tcobb@staff.circle.net>, "'freebsd-current@freebsd.org'" <freebsd-current@FreeBSD.ORG>, "'freebsd-scsi@freebsd.org'" <freebsd-scsi@FreeBSD.ORG>
Subject:   Re: DPT driver fails and panics with Degraded Array
Message-ID:  <19980529123029.12289@follo.net>
In-Reply-To: <19980529122551.16212@follo.net>; from Eivind Eklund on Fri, May 29, 1998 at 12:25:51PM %2B0200
References:  <509A2986E5C5D111B7DD0060082F32A402FAD1@freya.circle.net> <19980529122551.16212@follo.net>

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On Fri, May 29, 1998 at 12:25:51PM +0200, Eivind Eklund wrote:
> Hypothesis 1: The problem occur when using your type of controller,
>    RAID5+HotSpare, "large" amounts of capacity used, your kernel, and
>    a disk fail.
> Verification: Create above setup, try to fail a disk on it.
> 
> Now, which parameters to vary depend on whether we can get the above
> to crash.  It might be dependent on having exactly equal disks, too
> :-(

This was a pretty dumb way of saying this.  What I meant was that
forming further hypotheses/verifiction pairs in any effective manner
seems pretty difficult without knowing the results of the above test.

If you have more data, or more hypotheses/verification pairs, then
come with 'em.  If you want to be 100% certain of coming to a
conclusion, this is usually the way to do it (but it can be expensive
in terms of the number of tests you have to do).

Eivind.

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