From: Ric Wheeler <rwheeler@redhat.com>
To: Lee Revell <rlrevell@joe-job.com>
Cc: Ric Wheeler <ricwheeler@gmail.com>, Theodore Tso <tytso@mit.edu>,
Jens Axboe <jens.axboe@oracle.com>,
Mikulas Patocka <mpatocka@redhat.com>,
device-mapper development <dm-devel@redhat.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
ak@linux.intel.com, "MASON, CHRISTOPHER" <CHRIS.MASON@oracle.com>
Subject: Re: [dm-devel] Barriers still not passing on simple dm devices...
Date: Sun, 05 Apr 2009 18:24:13 -0700 [thread overview]
Message-ID: <49D959BD.7060002@redhat.com> (raw)
In-Reply-To: <75b66ecd0904051814n353bb69bp76a38e36cac4d3fe@mail.gmail.com>
On 04/05/2009 06:14 PM, Lee Revell wrote:
> On Sun, Apr 5, 2009 at 7:54 AM, Ric Wheeler<ricwheeler@gmail.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
next prev parent reply other threads:[~2009-04-06 1:25 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-23 19:04 Barriers still not passing on simple dm devices Eric Sandeen
2009-03-23 19:10 ` Eric Sandeen
2009-03-24 14:02 ` [dm-devel] " Mikulas Patocka
2009-03-24 14:05 ` Jens Axboe
2009-03-24 14:26 ` Mikulas Patocka
2009-03-24 14:30 ` Jens Axboe
2009-03-24 14:45 ` Mikulas Patocka
2009-03-24 15:05 ` Jens Axboe
2009-03-25 15:15 ` Mikulas Patocka
2009-03-25 15:27 ` Jens Axboe
2009-03-25 22:39 ` Mikulas Patocka
2009-03-26 8:42 ` Jens Axboe
2009-03-31 3:39 ` Mikulas Patocka
2009-03-31 10:49 ` Jens Axboe
2009-04-02 23:40 ` Mikulas Patocka
2009-04-03 8:11 ` Jens Axboe
2009-04-04 15:20 ` Ric Wheeler
2009-04-05 1:28 ` Theodore Tso
2009-04-05 11:54 ` Ric Wheeler
2009-04-06 1:14 ` Lee Revell
2009-04-06 1:24 ` Ric Wheeler [this message]
2009-04-08 12:44 ` Mikulas Patocka
2009-04-08 15:16 ` Henrique de Moraes Holschuh
2009-04-09 4:22 ` Eric Sandeen
2009-04-08 12:36 ` Mikulas Patocka
2009-04-08 12:54 ` Mikulas Patocka
2009-04-09 10:48 ` Ric Wheeler
2009-04-08 13:37 ` Mikulas Patocka
2009-04-08 14:06 ` Jens Axboe
2009-04-08 23:44 ` Dave Chinner
2009-04-09 1:27 ` Chris Mason
2009-04-09 10:28 ` Alasdair G Kergon
2009-03-26 12:55 ` Chris Mason
[not found] <ciXHh-39c-37@gated-at.bofh.it>
[not found] ` <cjfuL-6vJ-43@gated-at.bofh.it>
[not found] ` <cjfEl-6J2-45@gated-at.bofh.it>
[not found] ` <cjfNX-6Wh-27@gated-at.bofh.it>
2009-03-26 13:05 ` Bodo Eggert
[not found] ` <cjfXx-78D-9@gated-at.bofh.it>
[not found] ` <cjg7h-7lM-29@gated-at.bofh.it>
[not found] ` <cjgqC-80G-21@gated-at.bofh.it>
[not found] ` <cjD3I-22U-7@gated-at.bofh.it>
[not found] ` <cjDdE-2g3-31@gated-at.bofh.it>
[not found] ` <cjJVv-4vp-13@gated-at.bofh.it>
[not found] ` <cjXlS-uM-1@gated-at.bofh.it>
2009-03-26 15:26 ` Bodo Eggert
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