From: Dave Chinner <david@fromorbit.com>
To: Stan Hoeppner <stan@hardwarefreak.com>
Cc: Ben Myers <bpm@sgi.com>, Jan Perci <jperci@gmail.com>, xfs@oss.sgi.com
Subject: Re: Help with XFS in VMs on VMFS
Date: Sun, 31 Mar 2013 13:04:49 +1100 [thread overview]
Message-ID: <20130331020449.GM6369@dastard> (raw)
In-Reply-To: <51573924.2020304@hardwarefreak.com>
On Sat, Mar 30, 2013 at 02:12:36PM -0500, Stan Hoeppner wrote:
> On 3/29/2013 3:27 PM, Ben Myers wrote:
> > Hi Jan,
> >
> > On Thu, Mar 28, 2013 at 11:30:01PM -0400, Jan Perci wrote:
> >> Back to XFS, in this context, is there any benefit in tuning some
> >> parameters to get better performance, or will it all just be overshadowed
> >> by poor performance of the VMDKs that tuning isn't worthwhile?
> >
> > At least get your stripe unit and width correct.
> > http://xfs.org/index.php/XFS_FAQ#Q:_How_to_calculate_the_correct_sunit.2Cswidth_values_for_optimal_performance
>
> Is this really a good idea given that XFS sits atop a virtual disk which
> consists of multiple concatenated 2TB sparse files sitting on the VMFS
> filesystem, which, IIRC, has a 1MB sector size? Thus can one rely on
> XFS being able to properly align to the physical RAID stripe, even if
> the math is done 'properly' (if that's even possible here)?
No, because VMFS doesn't do any specific alignment to the underlying
storage geometry.
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
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prev parent reply other threads:[~2013-03-31 2:04 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-28 13:21 Help with XFS in VMs on VMFS Jan Perci
2013-03-28 14:59 ` Stefan Ring
2013-03-28 19:50 ` Stan Hoeppner
2013-03-28 21:45 ` Ralf Gross
2013-03-28 22:13 ` Emmanuel Florac
2013-03-29 14:23 ` Ralf Gross
2013-03-29 0:56 ` Stan Hoeppner
2013-03-29 3:30 ` Jan Perci
2013-03-29 20:27 ` Ben Myers
2013-03-30 19:12 ` Stan Hoeppner
2013-03-31 2:04 ` Dave Chinner [this message]
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