Re: Maximum file system size of XFS?

Ric Wheeler
2013-03-09T22:29:36Z

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