From owner-svn-src-projects@FreeBSD.ORG  Wed Jan  5 16:51:35 2011
Return-Path: <owner-svn-src-projects@FreeBSD.ORG>
Delivered-To: svn-src-projects@FreeBSD.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id CA944106566C;
	Wed,  5 Jan 2011 16:51:35 +0000 (UTC) (envelope-from imp@bsdimp.com)
Received: from harmony.bsdimp.com (bsdimp.com [199.45.160.85])
	by mx1.freebsd.org (Postfix) with ESMTP id 86A678FC14;
	Wed,  5 Jan 2011 16:51:35 +0000 (UTC)
Received: from [127.0.0.1] (localhost [127.0.0.1])
	by harmony.bsdimp.com (8.14.3/8.14.1) with ESMTP id p05Gk5Wg016760;
	Wed, 5 Jan 2011 09:46:05 -0700 (MST) (envelope-from imp@bsdimp.com)
Message-ID: <4D24A04C.7070601@bsdimp.com>
Date: Wed, 05 Jan 2011 09:46:04 -0700
From: Warner Losh <imp@bsdimp.com>
User-Agent: Mozilla/5.0 (X11; U; FreeBSD amd64; en-US;
	rv:1.9.2.12) Gecko/20101029 Thunderbird/3.1.6
MIME-Version: 1.0
To: Ivan Voras <ivoras@FreeBSD.org>
References: <201101042244.p04MiBf6057193@svn.freebsd.org>
	<AANLkTinjQdTmeXKhXd79dcEBYQRw98M+9NLz-3XEcLn-@mail.gmail.com>
In-Reply-To: <AANLkTinjQdTmeXKhXd79dcEBYQRw98M+9NLz-3XEcLn-@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
Cc: svn-src-projects@FreeBSD.org, src-committers@FreeBSD.org,
	Warner Losh <imp@FreeBSD.org>
Subject: Re: svn commit: r216978 - in projects/graid/head/sys: cam/ata conf
X-BeenThere: svn-src-projects@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: "SVN commit messages for the src &quot; projects&quot;
	tree" <svn-src-projects.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-projects>, 
	<mailto:svn-src-projects-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-projects>
List-Post: <mailto:svn-src-projects@freebsd.org>
List-Help: <mailto:svn-src-projects-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-projects>, 
	<mailto:svn-src-projects-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 05 Jan 2011 16:51:35 -0000

On 01/04/2011 16:37, Ivan Voras wrote:
> On 4 January 2011 23:44, Warner Losh<imp@freebsd.org>  wrote:
>> Author: imp
>> Date: Tue Jan  4 22:44:10 2011
>> New Revision: 216978
>> URL: http://svn.freebsd.org/changeset/base/216978
>>
>> Log:
>>   Implement three types of forced errors in the ada layer for the
>>   purpose of testing uppper layers in the stack.
>>
>>   kern.cam.ada.X.periodic_read_error specifies that every Nth read will
>>   fail.
>>
>>   kern.cam.ada.X.force_read_error specifies that the next N reads will fail.
>>
>>   kern.cam.ada.X.force_write_error specifies that the next N writes will fail.
>>
>>   These are enabled with 'options ADA_TEST_FAILURE'.  Otherwise, they
>>   aren't added to the kernel.  Also, the sysctl stuff is only used for
>>   this feature, so move it under this option ifdef.
> Maybe gnop would help you? (though on a different layer and
> nondeterministic failures)
Thanks for the suggestion.  I wasn't aware of that, and will add it to 
my toolkit.  These sysctls will help me force errors when I want them 
while testing graid behavior in a number of different scenarios.  gnop 
will help me cope with testing how they work out all together on flaky 
hardware w/o needing the flaky hardware.

Warner