[CentOS] Re: mkfs.ext3 on a 9TB volume -- [Practices] Striping
across intelligent RAID cards
Bryan J. Smith
b.j.smith at ieee.org
Mon Sep 12 17:04:26 UTC 2005
Francois Caen <frcaen at gmail.com> wrote:
> Wow! Odd! RH says 8TB but ext3 FAQ says 4TB.
Any filesystem originally designed for 32-bit x86 is full of
signed 32-bit structures. The 2^31 * 512 = 1.1TB (1TiB)
limit comes from those structures using a 512 sector size.
Ext3 has used a couple of different techniques to allow
larger and larger support. Depending on the hardware, kernel
(especially 2.4), etc..., there can be limits at 1, 2, 4, 8
Which is why the "common denominator" is 1.1TB (1TiB). It
was rather enfuriating in front of a client when I attempted
to mount one Ext3 volume
> >From my personal testing on CentOS 4.1, you can't go over
> 4TB without kludging.
> > I then did a software RAIDO across them, and finally:
> > mke2fs -b 4096 -j -m 0 -R stride=1024 -T largefile4
> Joshua, thanks for the reply on this.
> There's something kludgy about having to do softraid across
> partitions before formatting. It adds a layer of complexity
> reduces reliability. Is that the trick RH recommended to go
> up to 8TB?
> Francois Caen, RHCE, CCNA
> SpiderMaker, LLC
> CentOS mailing list
> CentOS at centos.org
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