From: Daniel Phillips <phillips@phunq.net>
To: David Newall <davidn@davidnewall.com>
Cc: david@lang.hm, Chris Friesen <cfriesen@nortel.com>,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
linux-kernel@vger.kernel.org
Subject: Re: [ANNOUNCE] Ramback: faster than a speeding bullet
Date: Thu, 13 Mar 2008 12:03:03 -0800 [thread overview]
Message-ID: <200803131303.04118.phillips@phunq.net> (raw)
In-Reply-To: <47D9856E.9010304@davidnewall.com>
On Thursday 13 March 2008 12:50, David Newall wrote:
> Daniel Phillips wrote:
> > The period where you cannot access the data is downtime. If your script
> > just does a cp from a disk array to the ram device you cannot just read
> > from the backing store in that period because you will need to fail over
> > to the ramdisk at some point, and you cannot just read from the ramdisk
> > because it is not populated yet.
>
> Wouldn't a raid-1 set comprising disk + ramdisk do that with no downtime?
In raid1, write completion has to wait for write completion on all
mirror members, so writes run at disk speed. Reads run at ramdisk
speed, so your proposal sounds useful, but ramback aims for high
write performance as well.
Daniel
next prev parent reply other threads:[~2008-03-13 20:03 UTC|newest]
Thread overview: 153+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-10 6:46 [ANNOUNCE] Ramback: faster than a speeding bullet Daniel Phillips
2008-03-10 7:51 ` Grzegorz Kulewski
2008-03-10 8:23 ` Daniel Phillips
2008-03-10 9:37 ` Alan Cox
2008-03-10 21:03 ` Lars Marowsky-Bree
2008-03-11 11:14 ` Daniel Phillips
2008-03-11 11:23 ` Lars Marowsky-Bree
2008-03-11 11:50 ` Daniel Phillips
2008-03-11 17:26 ` Chris Friesen
2008-03-11 19:56 ` Daniel Phillips
2008-03-11 20:53 ` Willy Tarreau
2008-03-12 8:17 ` Daniel Phillips
2008-03-12 14:41 ` Mike Snitzer
2008-03-13 20:34 ` Rik van Riel
2008-03-14 2:20 ` Daniel Phillips
2008-03-11 21:56 ` Lars Marowsky-Bree
2008-03-11 23:02 ` Daniel Phillips
2008-03-12 13:25 ` Benny Amorsen
2008-03-12 13:30 ` Alan Cox
2008-03-13 15:29 ` Benny Amorsen
2008-03-14 9:30 ` Pavel Machek
2008-03-14 11:07 ` Ric Wheeler
2008-03-14 11:41 ` Benny Amorsen
2008-03-14 12:12 ` Ric Wheeler
2008-03-14 12:56 ` Theodore Tso
2008-03-14 15:47 ` Ric Wheeler
2008-03-14 16:49 ` Theodore Tso
2008-03-14 17:04 ` Ric Wheeler
2008-03-14 18:03 ` david
2008-03-14 19:03 ` writeback cache dangers " Pavel Machek
2008-03-14 19:29 ` Theodore Tso
2008-03-13 9:15 ` Matthias Schniedermeyer
2008-03-11 23:30 ` Daniel Phillips
2008-03-13 13:27 ` Ric Wheeler
2008-03-13 19:02 ` Daniel Phillips
2008-03-13 19:12 ` Ric Wheeler
2008-03-13 19:38 ` Daniel Phillips
2008-03-11 4:23 ` Daniel Phillips
2008-03-10 9:22 ` Alan Cox
2008-03-10 19:01 ` Rik van Riel
2008-03-11 4:28 ` Daniel Phillips
2008-03-11 3:50 ` Daniel Phillips
2008-03-11 13:32 ` Artur Skawina
2008-03-11 14:31 ` Artur Skawina
2008-03-12 13:11 ` Alan Cox
2008-03-12 17:29 ` Daniel Phillips
2008-03-12 18:11 ` Chris Friesen
2008-03-12 22:56 ` Daniel Phillips
2008-03-13 5:45 ` David Newall
2008-03-13 6:17 ` Daniel Phillips
2008-03-13 6:30 ` David Newall
2008-03-13 6:50 ` Daniel Phillips
2008-03-13 7:05 ` David Newall
2008-03-13 7:13 ` Daniel Phillips
2008-03-15 13:32 ` Pavel Machek
2008-03-15 20:22 ` Daniel Phillips
2008-03-15 21:33 ` Pavel Machek
2008-03-15 21:47 ` Daniel Phillips
2008-03-13 6:32 ` david
2008-03-13 7:12 ` Daniel Phillips
2008-03-13 7:55 ` david
2008-03-13 8:06 ` Daniel Phillips
2008-03-13 8:39 ` david
2008-03-13 9:16 ` Daniel Phillips
2008-03-13 16:25 ` david
2008-03-13 19:32 ` Daniel Phillips
2008-03-13 19:50 ` David Newall
2008-03-13 20:03 ` Daniel Phillips [this message]
2008-03-14 17:53 ` Jeff Moyer
2008-03-15 20:26 ` Pavel Machek
2008-03-15 20:40 ` Mike Snitzer
2008-03-15 21:05 ` Daniel Phillips
2008-03-15 20:18 ` Pavel Machek
2008-03-15 20:51 ` Daniel Phillips
2008-03-13 9:49 ` Daniel Phillips
2008-03-13 5:39 ` David Newall
2008-03-13 6:14 ` Daniel Phillips
2008-03-13 13:22 ` Alan Cox
2008-03-13 19:14 ` Daniel Phillips
2008-03-13 20:27 ` Rik van Riel
2008-03-14 2:23 ` Daniel Phillips
2008-03-14 5:22 ` David Newall
2008-03-14 5:42 ` Daniel Phillips
2008-03-14 14:00 ` John Stoffel
2008-03-15 20:59 ` Willy Tarreau
2008-03-15 20:56 ` Alan Cox
2008-03-15 21:25 ` Daniel Phillips
2008-03-15 21:08 ` Alan Cox
2008-03-15 21:51 ` Daniel Phillips
2008-03-15 21:17 ` Daniel Phillips
2008-03-15 21:03 ` Alan Cox
2008-03-15 22:00 ` Daniel Phillips
2008-03-15 23:05 ` Alan Cox
2008-03-16 21:57 ` Daniel Phillips
2008-03-16 21:55 ` Alan Cox
2008-03-16 22:36 ` Daniel Phillips
2008-03-16 22:46 ` Alan Cox
2008-03-16 23:39 ` Daniel Phillips
2008-03-17 11:53 ` Alan Cox
2008-03-17 1:31 ` David Newall
2008-03-17 2:42 ` Daniel Phillips
2008-03-17 3:59 ` david
2008-03-17 5:52 ` Daniel Phillips
2008-03-17 6:49 ` david
2008-03-17 8:16 ` Daniel Phillips
2008-03-17 10:39 ` Alan Cox
2008-03-17 13:52 ` Ric Wheeler
2008-03-17 14:42 ` david
2008-03-17 17:23 ` david
2008-03-17 17:30 ` Willy Tarreau
[not found] ` <200803180233.10156.phillips@phunq.net>
2008-03-18 13:03 ` David Newall
2008-03-18 16:36 ` david
2008-03-31 11:40 ` Daniel Phillips
2008-04-01 0:28 ` david
2008-04-01 4:07 ` Daniel Phillips
2008-04-01 4:23 ` david
2008-04-01 6:08 ` Daniel Phillips
2008-03-18 13:57 ` Alan Cox
2008-03-31 11:39 ` Daniel Phillips
2008-03-17 7:14 ` David Newall
2008-03-17 8:25 ` Daniel Phillips
2008-03-17 18:56 ` David Newall
2008-03-23 9:33 ` Pavel Machek
2008-03-23 20:44 ` Daniel Phillips
2008-03-15 21:54 ` Willy Tarreau
2008-03-15 22:33 ` Daniel Phillips
2008-03-15 23:22 ` david
2008-03-15 23:57 ` Krzysztof Halasa
2008-03-15 23:22 ` Willy Tarreau
2008-03-16 3:33 ` Daniel Phillips
2008-03-16 5:24 ` David Newall
2008-03-16 12:49 ` Ingo Oeser
2008-03-16 6:56 ` Willy Tarreau
2008-03-16 22:12 ` Krzysztof Halasa
2008-03-16 13:14 ` Alan Cox
2008-03-16 19:04 ` Theodore Tso
2008-03-16 22:02 ` Krzysztof Halasa
2008-03-15 23:18 ` Bernd Eckenfels
2008-03-16 5:42 ` David Newall
2008-03-16 20:48 ` Daniel Phillips
2008-03-16 22:15 ` Krzysztof Halasa
2008-03-16 22:38 ` Daniel Phillips
2008-03-16 23:08 ` Krzysztof Halasa
2008-03-16 23:43 ` Daniel Phillips
2008-03-10 14:51 ` Artur Skawina
2008-03-10 18:49 ` Chris Snook
2008-03-11 5:06 ` Greg KH
2008-03-11 5:22 ` Daniel Phillips
2008-03-11 5:48 ` david
2008-03-11 6:27 ` Greg KH
2008-03-12 12:01 ` tvrtko.ursulin
2008-03-12 17:27 ` Daniel Phillips
[not found] <OFA00954A4.45F32CA2-ON8025740B.005D7B40-8025740B.005EECA6@sophos.com>
2008-03-13 19:34 ` Daniel Phillips
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