From: Felipe Alfaro Solana <felipe_alfaro@linuxmail.org>
To: Jonathan Vardy <jonathan@explainerdc.com>
Cc: linux-raid@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>
Subject: Re: RAID 5 performance problems
Date: 03 Apr 2003 23:06:24 +0200 [thread overview]
Message-ID: <1049403984.1175.2.camel@teapot.felipe-alfaro.com> (raw)
In-Reply-To: <73300040777B0F44B8CE29C87A0782E101FA97B2@exchange.explainerdc.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.
________________________________________________________________________
Linux Registered User #287198
next prev parent reply other threads:[~2003-04-03 20:55 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-04-03 15:45 Jonathan Vardy
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 22:09 ` Jonathan Vardy
2003-04-03 22:16 ` Jonathan Vardy
2003-04-03 22:28 ` Peter L. Ashford
2003-04-03 21:42 ` Jonathan Vardy
2003-04-03 22:13 ` Peter L. Ashford
2003-04-04 20:39 ` H. Peter Anvin
2003-04-03 21:06 ` Felipe Alfaro Solana [this message]
2003-04-03 21:14 ` Jonathan Vardy
2003-04-03 19:13 Neil Schemenauer
2003-04-03 19:49 Andy Arvai
2003-04-03 20:25 ` Mike Dresser
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 14:39 ` Ezra Nugroho
2003-04-04 15:05 Jonathan Vardy
2003-04-04 16:01 Jonathan Vardy
2003-04-05 0:10 ` Jonathan Vardy
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