16TB ext3 mainstream - when?

Andreas Dilger adilger at clusterfs.com
Wed Oct 4 05:50:03 UTC 2006

On Oct 03, 2006  19:20 -0500, Damian Menscher wrote:
> On Tue, 3 Oct 2006, Andreas Dilger wrote:
> >On Oct 03, 2006  23:30 +0100, Chris Allen wrote:
> >>Are we likely to see patches to allow 16TB ext3 in the mainstream
> >>kernel any time soon?
> >
> >I think the patches are going into -mm (if not already), so start 
> >testing...
> >If not, they have been posted here several times, along with a URL for
> >download.
> Will those patches work to grow an existing ext3 filesystem to >8TB, or 
> do they only work on new filesystems (created with those patches or 
> other special options)?

There are no special options or features needed to use > 8TB filesystems,
just bug fixes in the kernel.

> I ask because we need to create an <8TB filesystem now, but with the 
> option to grow it to >8TB in the future.

I have never tested that, and I don't know anyone else who has.  That
said, I'm not aware of any inherent limitations on growing the filesystem
up to 16TB.  I haven't looked at that code for a long time, and never
really with an eye toward scalability to 16TB.  It definitely will NOT
work to grow past 16TB at all.

Cheers, Andreas
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.

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