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

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Message-ID: <Pine.LNX.4.64.0904080839200.28196@hs20-bc2-1.build.redhat.com>
Date:	Wed, 8 Apr 2009 08:44:11 -0400 (EDT)
From:	Mikulas Patocka <mpatocka@...hat.com>
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>,
	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, 5 Apr 2009, 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.

I have seen an installation having generator backup, but with another 
serious flaw --- if someone plugged a computer causing short-circuit, it 
turned off the circuit breaker for the whole rack :)

Mikulas

> Lee
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