From: "H. Peter Anvin" <hpa@zytor.com>
To: linux-kernel@vger.kernel.org
Subject: Re: Journaling pointless with today's hard disks?
Date: 26 Nov 2001 16:32:05 -0800 [thread overview]
Message-ID: <9tumu5$e36$1@cesium.transmeta.com> (raw)
In-Reply-To: <0111261159080F.02001@localhost.localdomain> <Pine.LNX.3.95.1011126151922.29433A-100000@chaos.analogic.com>
Followup to: <Pine.LNX.3.95.1011126151922.29433A-100000@chaos.analogic.com>
By author: "Richard B. Johnson" <root@chaos.analogic.com>
In newsgroup: linux.dev.kernel
>
> It isn't that easy! Any kind of power storage within the drive would
> have to be isolated with diodes so that it doesn't try to run your
> motherboard as well as the drive. This means that +5 volt logic supply
> would now be 5.0 - 0.6 = 4.4 volts at the drive, well below the design
> voltage. Use of a Schottky diode (0.34 volts) would help somewhat, but you
> have now narrowed the normal power design-margin by 90 percent, not good.
>
Hardly a big deal since most logic is 3.3V these days (remember, you
don't need to maintain VccIO since the bus is dead anyway).
-hpa
--
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
http://www.zytor.com/~hpa/puzzle.txt <amsp@zytor.com>
next prev parent reply other threads:[~2001-11-27 0:32 UTC|newest]
Thread overview: 86+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-11-24 13:03 Journaling pointless with today's hard disks? Florian Weimer
2001-11-24 13:40 ` Rik van Riel
2001-11-24 16:36 ` Phil Howard
2001-11-24 17:19 ` Charles Marslett
2001-11-24 17:31 ` Florian Weimer
2001-11-24 17:41 ` Matthias Andree
2001-11-24 19:20 ` Florian Weimer
2001-11-24 19:29 ` Rik van Riel
2001-11-24 22:51 ` John Alvord
2001-11-24 23:41 ` Phil Howard
2001-11-25 0:24 ` Ian Stirling
2001-11-25 0:53 ` Phil Howard
2001-11-25 1:25 ` H. Peter Anvin
2001-11-25 1:44 ` Sven.Riedel
2001-11-24 22:28 ` H. Peter Anvin
2001-11-25 4:49 ` Andre Hedrick
2001-11-24 23:04 ` Pedro M. Rodrigues
2001-11-24 23:23 ` Stephen Satchell
2001-11-24 23:29 ` H. Peter Anvin
2001-11-26 18:05 ` Steve Brueggeman
2001-11-26 23:49 ` Martin Eriksson
2001-11-27 0:06 ` Andreas Dilger
2001-11-27 0:16 ` Andre Hedrick
2001-11-27 7:38 ` Andreas Dilger
2001-11-27 11:48 ` Ville Herva
2001-11-27 0:18 ` Jonathan Lundell
2001-11-27 1:01 ` Ian Stirling
2001-11-27 1:33 ` H. Peter Anvin
2001-11-27 1:57 ` Steve Underwood
2001-11-27 5:04 ` Stephen Satchell
2001-11-25 12:30 ` Matthias Andree
2001-11-25 15:04 ` Barry K. Nathan
2001-11-25 16:31 ` Matthias Andree
2001-11-27 2:39 ` Pavel Machek
2001-12-03 10:23 ` Matthias Andree
[not found] ` <mailman.1006644421.6553.linux-kernel2news@redhat.com>
2001-11-25 4:20 ` Pete Zaitcev
2001-11-25 13:52 ` Pedro M. Rodrigues
2001-11-25 9:14 ` Chris Wedgwood
2001-11-25 22:55 ` Daniel Phillips
2001-11-26 16:59 ` Rob Landley
2001-11-26 20:30 ` Andre Hedrick
2001-11-26 20:35 ` Rob Landley
2001-11-26 23:59 ` Andreas Dilger
2001-11-27 0:24 ` H. Peter Anvin
2001-11-27 0:52 ` H. Peter Anvin
2001-11-27 1:11 ` Andrew Morton
2001-11-27 1:15 ` H. Peter Anvin
2001-11-27 16:59 ` Matthias Andree
2001-11-27 16:56 ` Matthias Andree
2001-11-27 1:23 ` Ian Stirling
2001-11-26 23:00 ` Rob Landley
2001-11-27 2:41 ` H. Peter Anvin
2001-11-27 0:19 ` Rob Landley
2001-11-27 23:35 ` Andreas Bombe
2001-11-28 14:32 ` Rob Landley
2001-11-27 3:39 ` Ian Stirling
2001-11-27 7:03 ` Ville Herva
2001-11-27 16:50 ` Matthias Andree
2001-11-27 20:31 ` Rob Landley
2001-11-28 18:43 ` Matthias Andree
2001-11-28 18:46 ` Rob Landley
2001-11-28 22:19 ` Matthias Andree
2001-11-29 22:21 ` Pavel Machek
2001-12-01 10:55 ` Jeff V. Merkey
2001-12-02 0:08 ` Matthias Andree
2001-12-03 20:04 ` Pavel Machek
2001-11-26 20:53 ` Richard B. Johnson
2001-11-26 21:18 ` Journaling pointless with today's hard disks? [wandering OT] Rob Landley
2001-11-27 0:32 ` H. Peter Anvin [this message]
2001-11-27 16:39 ` Journaling pointless with today's hard disks? Matthias Andree
2001-11-27 17:42 ` Martin Eriksson
2001-11-28 16:35 ` Ian Stirling
2001-11-26 17:14 ` Steve Brueggeman
2001-11-26 20:36 ` Andre Hedrick
2001-11-26 21:14 ` Steve Brueggeman
2001-11-26 21:36 ` Andre Hedrick
2001-11-27 16:36 ` Steve Brueggeman
2001-11-27 20:04 ` Bill Davidsen
2001-11-27 21:28 ` Wayne Whitney
2001-11-27 21:52 ` Andre Hedrick
2001-11-28 11:53 ` Pedro M. Rodrigues
-- strict thread matches above, loose matches on Subject: below --
2001-11-25 1:20 dnu478nt5w@mailexpire.com
2001-11-28 14:36 Galappatti, Kishantha
2001-11-28 17:22 David Balazic
2001-11-28 23:25 Frank de Lange
2001-11-29 1:52 ` Matthias Andree
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