We have a single 27TB partition (35 x 1TB drives as RAID5+0 in an HP MDS600), just formatted it xfs and had no problems with it so far.
It's used as scratch space so not too concerned about performance.
--Russell
> -----Original Message-----
> From: centos-bounces@xxxxxxxxxx [mailto:centos-bounces@xxxxxxxxxx] On
> Behalf Of Marian Marinov
> Sent: Friday, 24 June 2011 7:48 a.m.
> To: CentOS mailing list
> Subject: Re: ext4 in CentOS 5.6?
>
> On Thursday 23 June 2011 22:31:28 PJ wrote:
> > On Thu, Jun 23, 2011 at 1:07 PM, Marian Marinov <mm@xxxxxxxx> wrote:
> > > On Thursday 23 June 2011 19:16:37 PJ wrote:
> > >> I'm sure many are running ext4 FS's in production, but just want
> to
> > >> be re-assured that there are not currently any major issues before
> > >> starting a new project that looks like it will be using ext4.
> > >>
> > >> I've previously been using xfs but the software for this project
> > >> requires ext3/ext4.
> > >>
> > >> I'm always very cautious before jumping onto a new FS, (new in the
> > >> sense it is officially supported now)
> > >>
> > >> Thanks in advance!
> > >
> > > I'm running some 50 servers with ext4 each server has 2x15TB ext4
> > > partitions. I haven't had an issue with that setup. The first
> server
> > > was setup 3 years ago. It is quite faster then XFS in terms of
> write
> > > performance and thus far reliable without any major problem.
> > >
> > > Keep in mind that user land tools are limited and the biggest
> > > partition you can create with them at the moment is 16TB. You can
> > > recompile the tools and remove this limitation if that is a problem
> for you.
> > >
> > > Regards,
> > > Marian Marinov
> >
> > Thanks for all the great replies everyone.
> >
> > I've got an 18TB partition - the limit is 16TB even in x86_64?
>
> Yes. At least it was so, last year. I haven't checked recently. And I
> don't have a spare machine to repartition for the test.
> We have a 30TB RAID6 array and I was really annoyed that I had to make
> two partitions to utilze the whole space.
>
> The wiki pages are still not updated:
> http://en.wikipedia.org/wiki/Comparison_of_file_systems
> https://ext4.wiki.kernel.org/index.php/Ext4_Howto
>
> NOTE: Although very large fileystems are on ext4's feature list,
> current e2fsprogs currently still limits the filesystem size to 2^32
> blocks (16TiB for a 4KiB block filesystem). Allowing filesystems larger
> than 16T is one of the very next high-priority features to complete for
> ext4.
>
>
>
> > _______________________________________________
> > CentOS mailing list
> > CentOS@xxxxxxxxxx
> > http://lists.centos.org/mailman/listinfo/centos
>
> --
> Best regards,
> Marian Marinov
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