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Re: Maximum file system size of XFS?

To: Pascal <pa5ca1@xxxxxx>
Subject: Re: Maximum file system size of XFS?
From: Ric Wheeler <rwheeler@xxxxxxxxxx>
Date: Sat, 09 Mar 2013 17:29:23 -0500
Cc: linux-xfs@xxxxxxxxxxx
Delivered-to: linux-xfs@xxxxxxxxxxx
In-reply-to: <20130309215121.0e614ef8@thinky>
References: <20130309215121.0e614ef8@thinky>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130219 Thunderbird/17.0.3
On 03/09/2013 03:51 PM, Pascal wrote:

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

Thank you in advance!


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 :)


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