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Date: Sun, 05 Apr 2009 18:24:13 -0700 From: Ric Wheeler <rwheeler@...hat.com> To: Lee Revell <rlrevell@...-job.com> CC: Ric Wheeler <ricwheeler@...il.com>, Theodore Tso <tytso@....edu>, 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 04/05/2009 06:14 PM, 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 my experience, you will see multiple customers with and without UPS backup. I have certainly dealt personally with many data centers that lost power without them & see array vendors that continue to build in their own batteries... ric -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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