From: Patrick Caulfield <caulfield@sistina.com>
To: linux-lvm@sistina.com
Subject: Re: [linux-lvm] Paralell IO performance with LVM and XFS
Date: Thu Jan 17 09:22:02 2002 [thread overview]
Message-ID: <20020117152130.GG1066@tykepenguin.com> (raw)
In-Reply-To: <20020117125640.35CF032FDE6@lyta.coker.com.au>
On Thu, Jan 17, 2002 at 01:56:39PM +0100, Russell Coker wrote:
> On Thu, 17 Jan 2002 13:29, Miguel Angel de Vega wrote:
> > I've a Dual P2 450 with a Disk Array with 4 scsi disks with XFS.
> > With one single disc I've 10 Mb/s reading and writing, so I think that if I
> > stripe all disc of the array, it can give me 4x10Mb = 40Mb/s more or less,
> > but I only gets 10 Mg/s!!
>
> Striping across 4 disks will never give you 4* the throughput of 1 disk, but
> you would hope for double the throughput.
A graph of some tests I did using bonnie++ and striping on fibre-channel disks
is online at http://www.cix.co.uk/~tykepenguin/stripetests.png
The most obvious bottleneck there was the actually FC interface which ran
out of capacity at 3 stripes.
patrick
next prev parent reply other threads:[~2002-01-17 9:22 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-01-17 6:30 [linux-lvm] Paralell IO performance with LVM and XFS Miguel Angel de Vega
2002-01-17 6:57 ` Russell Coker
2002-01-17 9:22 ` Patrick Caulfield [this message]
2002-01-17 10:36 ` mitch
2002-01-17 10:44 ` Patrick Caulfield
2002-01-17 11:07 ` Austin Gonyou
2002-01-17 11:21 ` Patrick Caulfield
2002-01-17 11:40 ` Russell Coker
2002-01-17 11:59 ` Patrick Caulfield
2002-01-17 13:12 ` Austin Gonyou
2002-01-18 9:06 ` Patrick Caulfield
2002-01-17 21:13 ` Stephen Lord
2002-01-18 6:49 ` Heinz J . Mauelshagen
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