From: "Jonathan Vardy" <jonathanv@explainerdc.com>
To: Felipe Alfaro Solana <felipe_alfaro@linuxmail.org>,
Jonathan Vardy <jonathan@explainerdc.com>
Cc: linux-raid@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>
Subject: Re: RAID 5 performance problems
Date: Thu, 3 Apr 2003 23:14:12 +0200 [thread overview]
Message-ID: <005801c2fa25$f97d0810$2e77c23e@pentium4> (raw)
In-Reply-To: 1049403984.1175.2.camel@teapot.felipe-alfaro.com
> On Thu, 2003-04-03 at 17:45, Jonathan Vardy wrote:
> > I'm having trouble with getting the right performance out of my software
> > raid 5 system. I've installed Red Hat 9.0 with kernel 2.4.20 compiled
> > myself to match my harware (had the same problem with the default
> > kernel). When I test the raid device's speed using 'hdparm -Tt /dev/hdx'
> > I get this:
> > /dev/md0:
> > Timing buffer-cache reads: 128 MB in 1.14 seconds =112.28 MB/sec
> > Timing buffered disk reads: 64 MB in 2.39 seconds = 26.78 MB/sec
>
> Well, if I'm not wrong, you're testing physical, individual drives, not
> the RAID5, combined, logical volume. So, your values are pretty normal.
/dev/md0 is the raid device and as you can see from the bonny++ results in
my original mail the, performance is not really normal.
WARNING: multiple messages have this Message-ID (diff)
From: "Jonathan Vardy" <jonathanv@explainerdc.com>
To: "Felipe Alfaro Solana" <felipe_alfaro@linuxmail.org>,
"Jonathan Vardy" <jonathan@explainerdc.com>
Cc: <linux-raid@vger.kernel.org>, "LKML" <linux-kernel@vger.kernel.org>
Subject: Re: RAID 5 performance problems
Date: Thu, 3 Apr 2003 23:14:12 +0200 [thread overview]
Message-ID: <005801c2fa25$f97d0810$2e77c23e@pentium4> (raw)
In-Reply-To: 1049403984.1175.2.camel@teapot.felipe-alfaro.com
> On Thu, 2003-04-03 at 17:45, Jonathan Vardy wrote:
> > I'm having trouble with getting the right performance out of my software
> > raid 5 system. I've installed Red Hat 9.0 with kernel 2.4.20 compiled
> > myself to match my harware (had the same problem with the default
> > kernel). When I test the raid device's speed using 'hdparm -Tt /dev/hdx'
> > I get this:
> > /dev/md0:
> > Timing buffer-cache reads: 128 MB in 1.14 seconds =112.28 MB/sec
> > Timing buffered disk reads: 64 MB in 2.39 seconds = 26.78 MB/sec
>
> Well, if I'm not wrong, you're testing physical, individual drives, not
> the RAID5, combined, logical volume. So, your values are pretty normal.
/dev/md0 is the raid device and as you can see from the bonny++ results in
my original mail the, performance is not really normal.
next prev parent reply other threads:[~2003-04-03 21:14 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-04-03 15:45 RAID 5 performance problems Jonathan Vardy
2003-04-03 15:45 ` Jonathan Vardy
2003-04-03 18:05 ` Peter L. Ashford
2003-04-03 18:05 ` Peter L. Ashford
2003-04-03 18:47 ` Ross Vandegrift
2003-04-03 19:22 ` Stephan van Hienen
2003-04-03 19:20 ` Stephan van Hienen
2003-04-03 19:28 ` Alan Cox
2003-04-03 21:02 ` Ezra Nugroho
2003-04-03 21:25 ` Stephan van Hienen
2003-04-03 21:38 ` Peter L. Ashford
2003-04-03 21:38 ` Peter L. Ashford
2003-04-03 22:09 ` Jonathan Vardy
2003-04-03 22:09 ` Jonathan Vardy
2003-04-03 22:16 ` Jonathan Vardy
2003-04-03 22:16 ` Jonathan Vardy
2003-04-03 22:28 ` Peter L. Ashford
2003-04-03 22:28 ` Peter L. Ashford
2003-04-03 21:42 ` Jonathan Vardy
2003-04-03 21:42 ` Jonathan Vardy
2003-04-03 22:13 ` Peter L. Ashford
2003-04-03 22:13 ` Peter L. Ashford
2003-04-04 20:39 ` H. Peter Anvin
2003-04-03 21:06 ` Felipe Alfaro Solana
2003-04-03 21:14 ` Jonathan Vardy [this message]
2003-04-03 21:14 ` Jonathan Vardy
-- strict thread matches above, loose matches on Subject: below --
2003-04-03 19:13 Neil Schemenauer
2003-04-03 19:49 Andy Arvai
2003-04-03 20:25 ` Mike Dresser
2003-04-03 20:25 ` Mike Dresser
2003-04-03 21:10 ` Jonathan Vardy
2003-04-03 21:10 ` Jonathan Vardy
2003-04-03 21:31 ` Ezra Nugroho
2003-04-03 20:10 Chuck Ebbert
2003-04-04 11:44 Jonathan Vardy
2003-04-04 11:44 ` Jonathan Vardy
2003-04-04 14:39 ` Ezra Nugroho
2003-04-04 15:05 Jonathan Vardy
2003-04-04 15:05 ` Jonathan Vardy
2003-04-04 16:01 Jonathan Vardy
2003-04-04 16:01 ` Jonathan Vardy
2003-04-05 0:10 ` Jonathan Vardy
2003-04-05 0:10 ` Jonathan Vardy
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