From: "Keld Jørn Simonsen" <keld@keldix.com>
To: David Brown <david.brown@hesbynett.no>
Cc: linux-raid@vger.kernel.org
Subject: Re: mdadm raid1 read performance
Date: Sat, 7 May 2011 12:58:57 +0200 [thread overview]
Message-ID: <20110507105857.GA32569@www2.open-std.org> (raw)
In-Reply-To: <iq37cu$stq$1@dough.gmane.org>
On Sat, May 07, 2011 at 12:37:18PM +0200, David Brown wrote:
> On 06/05/11 23:05, Leslie Rhorer wrote:
> > These systems use so little swap space and so rarely, I'm not sure I
> >see any benefit to RAID10,f2 for them. Is there?
> >
>
> Obviously when you use swap rarely, it makes little difference how it is
> laid out on the disk. And since it is small, there is no difference
> between the speed of the outer and inner tracks (for HD's - for SSD's
> there is obviously no difference), so you don't gain there. raid10,f2
> will still be better than raid1 for larger reads from swap - but I think
> you would have a hard time trying to spot that effect in the real world.
I think swap on raid10,f2 mostly matters on workstations, where you have
big apps like OpenOffice.org or firefox, and limited RAM.
best regards
keld
next prev parent reply other threads:[~2011-05-07 10:58 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-04 0:07 mdadm raid1 read performance Liam Kurmos
2011-05-04 0:57 ` John Robinson
2011-05-06 20:44 ` Leslie Rhorer
2011-05-06 21:56 ` Keld Jørn Simonsen
2011-05-04 0:58 ` NeilBrown
2011-05-04 5:30 ` Drew
2011-05-04 6:31 ` Brad Campbell
2011-05-04 7:42 ` Roberto Spadim
2011-05-04 23:08 ` Liam Kurmos
2011-05-04 23:35 ` Roberto Spadim
2011-05-04 23:36 ` Brad Campbell
2011-05-04 23:45 ` NeilBrown
2011-05-04 23:57 ` Roberto Spadim
2011-05-05 0:14 ` Liam Kurmos
2011-05-05 0:20 ` Liam Kurmos
2011-05-05 0:25 ` Roberto Spadim
2011-05-05 0:40 ` Liam Kurmos
2011-05-05 7:26 ` David Brown
2011-05-05 10:41 ` Keld Jørn Simonsen
2011-05-05 11:38 ` David Brown
2011-05-06 4:14 ` CoolCold
2011-05-06 7:29 ` David Brown
2011-05-06 21:05 ` Leslie Rhorer
2011-05-07 10:37 ` David Brown
2011-05-07 10:58 ` Keld Jørn Simonsen [this message]
2011-05-05 0:24 ` Roberto Spadim
2011-05-05 11:10 ` Keld Jørn Simonsen
2011-05-06 21:20 ` Leslie Rhorer
2011-05-06 21:53 ` Keld Jørn Simonsen
2011-05-07 3:17 ` Leslie Rhorer
2011-05-05 4:06 ` Roman Mamedov
2011-05-05 8:06 ` Nikolay Kichukov
2011-05-05 8:39 ` Liam Kurmos
2011-05-05 8:49 ` Liam Kurmos
2011-05-05 9:30 ` NeilBrown
2011-05-04 7:48 ` David Brown
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