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Re: xfs_fsr, performance related tweaks

To: "Just Marc" <marc@xxxxxxxxx>
Subject: Re: xfs_fsr, performance related tweaks
From: "Barry Naujok" <bnaujok@xxxxxxx>
Date: Fri, 29 Jun 2007 16:41:22 +1000
Cc: xfs@xxxxxxxxxxx
In-reply-to: <4684A506.4030705@xxxxxxxxx>
Organization: SGI
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On Fri, 29 Jun 2007 16:21:58 +1000, Just Marc <marc@xxxxxxxxx> wrote:

Hi Eric,

In my particular case, and I'm sure for many other people, files that are stored never change again until they deleted. I hinted that there could be a command line switch to turn this functionality on, as it may not be perfect for everyone's use cases.

If nobody likes this still, I would appreciate some hints on how to mark files as no-defrag from within fsr itself given that I only have the file descriptor ... A hack like looking up the descriptor in /proc/self/fd should work, but is linux specific and is too hackish in my opinion. I'd like to at least have a nice simple patch for my own uses.

Eric,

You can use the xfs_io chattr command to mark known files as
nodefrag. Using the chattr -R option can be used to recurse
directories.

Regards,
Barry.


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