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From: "K. Richard Pixley" <rich@noir.com>
To: Thomas Mueller <thomas@chaschperli.ch>
Cc: ceph-devel@vger.kernel.org
Subject: Re: simple performance tests
Date: Wed, 16 Jun 2010 10:58:01 -0700	[thread overview]
Message-ID: <4C1910A9.4030305@noir.com> (raw)
In-Reply-To: <hva4nu$2nr$1@dough.gmane.org>

Hi.  I've been running some similar tests recently, (on ubuntu, but still).

Thomas Mueller wrote:
> dbench 1 results:
> * 1 disk, btrfs: 115
> * 2 disks, btrfs data/metadata raid0: 115
>   
This is suspicious.

I'm also not sure whether you mean that you're running btrfs on an md or 
lvm stripe or using multiple device btrfs file systems.

My numbers are showing that btrfs multidevice support may not be very 
good right now but I get pretty good results from lvm stripes.  The 
hardware I'm testing now is the first hardware I've tried, (of prolly a 
couple dozen over the years), where the controller can actually keep all 
disks spinning.  Most cannot.

Try building an lvm stripe on your two disks and testing dd directly to 
the stripe.

--rich



      parent reply	other threads:[~2010-06-16 18:06 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-06-16  9:15 simple performance tests Thomas Mueller
2010-06-16  9:49 ` Wido den Hollander
2010-06-16 10:35   ` Thomas Mueller
2010-06-16 14:45 ` Gregory Farnum
2010-06-17  8:53   ` Thomas Mueller
2010-06-18  8:10     ` Thomas Mueller
2010-06-16 17:58 ` K. Richard Pixley [this message]

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