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Re: Small files perform much faster on newly formatted fs?

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: Small files perform much faster on newly formatted fs?
From: Norbert Veber <nveber@xxxxxxxxxxxxxx>
Date: Thu, 9 Jun 2011 20:54:57 -0400
Cc: Michael Monnerie <michael.monnerie@xxxxxxxxxxxxxxxxxxx>, xfs@xxxxxxxxxxx
In-reply-to: <20110609211731.GT32466@dastard>
References: <20110607163742.GH28625@xxxxxxxxxxxxxx> <201106080911.11286@xxxxxx> <20110608122638.GQ28625@xxxxxxxxxxxxxx> <20110609012907.GR32466@dastard> <20110609134811.GI28625@xxxxxxxxxxxxxx> <20110609211731.GT32466@dastard>
User-agent: Mutt/1.5.20 (2009-06-14)
On Fri, Jun 10, 2011 at 07:17:31AM +1000, Dave Chinner wrote:
> The mount options are only there to cahnge the alignment that
> already exists, and there are significant limitations on those
> changes.

Oh I see.  I will reformat and set sunit/swidth for my current 3 disk
raid5 (2 data disks).  What if I later add a 4th disk (3 data disks),
would using the mount option to specify the new swidth have any
performance hit?  

I assume old files might work slower but any new data that is written
would be aligned across all the drives?  Or should I just reformat again
at that point?

Thanks,

Norbert

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