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Date: Sat, 9 Mar 2013 23:39:40 +0100
From: Pascal <pa5ca1@gmx.de>
Subject: Re: Maximum file system size of XFS?
Message-ID: <20130309233940.3b7c0910@thinky>
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References: <20130309215121.0e614ef8@thinky>
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Am Sat, 09 Mar 2013 17:29:23 -0500
schrieb Ric Wheeler <rwheeler@redhat.com>:

> On 03/09/2013 03:51 PM, Pascal wrote:
> > Hello,
> >
> > I am asking you because I am insecure about the correct answer and
> > different sources give me different numbers.
> >
> >
> > My question is: What is the maximum file system size of XFS?
> >
> > The official page says: 2^63 = 9 x 10^18 = 9 exabytes
> > Source: http://oss.sgi.com/projects/xfs/
> >
> > Wikipedia says 16 exabytes.
> > Source: https://en.wikipedia.org/wiki/XFS
> >
> > Another reference books says 8 exabytes (2^63).
> >
> >
> > Can anyone tell me and explain what is the maximum file system size
> > for XFS?
> >
> >
> > Thank you in advance!
> >
> > Pascal
> >
> 
> The maximum size that XFS can address (which is what most people post
> in things like wikipedia) is kind of a fantasy number.
> 
> What is a better question is what is the maximum size XFS file system
> people have in production (even better, people who have your same
> work load). Lots and lots of tiny files are more challenging than
> very large video files for example.
> 
> I think that you can easily find people with 100's of terabytes in
> production use. For Red Hat, we support production use of 100TB per
> XFS instance in RHEL6 for example since that is what we test at (and
> have been know to officially support larger instances by exception).
> 
> Some of the things to watch out for in very large file systems is how
> much DRAM you have in the server. If you ever need to xfs_repair a
> 1PB file system, you will need a very beefy box :)
> 
> Ric
> 
> _______________________________________________
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> xfs@oss.sgi.com
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> 

Hello Ric,

thank you for your answer. I am aware that there is a difference
between the maximum size under practical conditions and the theoretical
maximum. But I am looking for this theoretical number to use in within
in my thesis comparing file systems.

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