linux-ext4 - Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes

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Message-ID: <4830543A.1000804@gmail.com>
Date:	Sun, 18 May 2008 12:07:22 -0400
From:	Ric Wheeler <ricwheeler@...il.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Theodore Tso <tytso@....edu>, Chris Mason <chris.mason@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Eric Sandeen <sandeen@...hat.com>, linux-ext4@...r.kernel.org,
	linux-ker@...stfloor.org
Subject: Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes

Andi Kleen wrote:
> Ric Wheeler <ricwheeler@...il.com> writes:
>   
>> The hard thing is to figure out how to test this kind of scenario
>> without dropping power. To expose the failure mode, it might be
>>     
>
> Why not drop power? (see test scenario in previous mail) 
>
> There are lots of cheap ways available to do that.
> I personally keep my test machines on cheap USB power switches and 
> can switch them any time. 
>
> It will probably lower the MTBF of your test boxes somewhat 
> though, but that's the price for good testing.
>   
The concern, as you mentioned above, is that you wear the equipment out 
with this kind of thing. Power supplies are probably the most impacted ;-)

>   
>> Just a personal note, my last day at EMC was this past Friday. Monday,
>> I start working for Red Hat (focused on file systems) so I will have
>> to figure out to get this kind of test going without all of my big EMC
>> toys ;-)
>>     
>
> Congratulations on the new job. I don't think you need any big toys though.
>
> -Andi
>   
Thanks!

ric

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