linux-kernel - Re: [dm-devel] Barriers still not passing on simple dm devices...

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Message-ID: <49DD7812.1030408@sandeen.net>
Date:	Wed, 08 Apr 2009 23:22:42 -0500
From:	Eric Sandeen <sandeen@...deen.net>
To:	Lee Revell <rlrevell@...-job.com>
CC:	Ric Wheeler <ricwheeler@...il.com>, Theodore Tso <tytso@....edu>,
	Ric Wheeler <rwheeler@...hat.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Mikulas Patocka <mpatocka@...hat.com>,
	device-mapper development <dm-devel@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	ak@...ux.intel.com, "MASON, CHRISTOPHER" <CHRIS.MASON@...cle.com>
Subject: Re: [dm-devel] Barriers still not passing on simple dm devices...

Lee Revell wrote:
> On Sun, Apr 5, 2009 at 7:54 AM, Ric Wheeler <ricwheeler@...il.com> wrote:
>> One thing to point out here is that there are a lot of "servers" in high end
>> data centers that do not have UPS backup. Those racks full of 1U and 2U
>> boxes that are used to make "grids", "clouds" and so on often are built with
>> as much gear as you can stuff in a rack - no batteries or UPS to be seen, so
>> they are really quite similar to the normal desktop or home systems that we
>> normally run at home :-)
> 
> These days even bargain basement data centers provide UPS functionality for
> you, via generator backup and A/B power.
> 
> Lee

In that case, you can turn off barriers.  It's still no excuse, IMHO,
for us to ship a journaling filesystem configuration which is known to
corrupt on power loss, by default.

-Eric
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