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Re: Linux mkfs.xfs parameters for large files

To: Jamie Tufnell <diesql@xxxxxxxxxxxxxx>
Subject: Re: Linux mkfs.xfs parameters for large files
From: Eric Sandeen <sandeen@xxxxxxxxxxx>
Date: Tue, 05 Feb 2008 08:56:01 -0600
Cc: xfs@xxxxxxxxxxx
In-reply-to: <b0a4f3350802050342i48525c02we95a2a4e89327688@mail.gmail.com>
References: <b0a4f3350802050342i48525c02we95a2a4e89327688@mail.gmail.com>
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Jamie Tufnell wrote:
> Hi,
> 
> I've done some research into how to best-prepare our Linux (2.6.18)
> XFS filesystem for a read-heavy workload of mostly large files (files
> between 50MB and 500MB) and I have some questions on block-sizes /
> extents.
> 
> My experience with other filesystems leads me to believe I should
> experiment with large block-sizes for this application.  In trying to
> do so, I found that the Linux XFS implementation forces the block size
> to not exceed the page size -- 4kB -- which seems a bit small in this
> case.  At first, I thought this was *really* bad news for me but I've
> since read some posts and the impression I'm getting is it's not that
> big of a deal?

In your careful benchmarking & testing, which aspects of the performance
you've found does not meet your needs or expectations?  That's always a
good place to start.

-Eric


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