From: Dave Chinner <david@fromorbit.com>
To: Christian Affolter <c.affolter@purplehaze.ch>
Cc: xfs@oss.sgi.com
Subject: Re: Random write result differences between RAID device and XFS
Date: Sat, 30 Jan 2016 09:25:53 +1100 [thread overview]
Message-ID: <20160129222553.GK20456@dastard> (raw)
In-Reply-To: <56AB44AF.8020807@purplehaze.ch>
On Fri, Jan 29, 2016 at 11:53:35AM +0100, Christian Affolter wrote:
> Hi everyone,
>
> I'm trying to understand the differences of some bandwidth and IOPs test
> results I see while running a random-write full-stripe-width aligned fio
> test (using libaio with direct IO) on a hardware RAID 6 raw device
> versus on the same device with the XFS file system on top of it.
>
> On the raw device I get:
> write: io=24828MB, bw=423132KB/s, iops=137, runt= 60085msec
>
> With XFS on top of it:
> write: io=14658MB, bw=249407KB/s, iops=81, runt= 60182msec
Now repeat with a file that is contiguously allocated before you
start. And also perhaps with the "swalloc" mount option.
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
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next prev parent reply other threads:[~2016-01-29 22:26 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-29 10:53 Random write result differences between RAID device and XFS Christian Affolter
2016-01-29 22:25 ` Dave Chinner [this message]
2016-01-30 10:43 ` Christian Affolter
2016-02-01 5:46 ` Dave Chinner
2016-02-01 8:59 ` Christian Affolter
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