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

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Date:	Sun, 5 Apr 2009 21:14:42 -0400
From:	Lee Revell <rlrevell@...-job.com>
To:	Ric Wheeler <ricwheeler@...il.com>
Cc:	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...

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
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