linux-ext4 - Re: EXT4 Larger Than 16TB

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Date:	Mon, 22 Jul 2013 07:43:26 +0800
From:	Zheng Liu <gnehzuil.liu@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Michael <mike@...ftx.net>, Theodore Ts'o <tytso@....edu>,
	linux-ext4@...r.kernel.org
Subject: Re: EXT4 Larger Than 16TB

On Sun, Jul 21, 2013 at 03:47:04PM -0700, H. Peter Anvin wrote:
> On 07/09/2013 06:45 AM, Michael wrote:
> > No problem, it sounds like it would be a very tricky bit of code to
> > write. Shuffling metadata blocks is not an easy feat.
> > 
> > Is there any way to tell if I'm using 64 bit? Ubuntu defaults to
> > setting ext4 to default, but I don't know if it did when I first
> > created this FS.
> > 
> > If it is 64 bit, the resize2fs utility should be able to handle this
> > one kernels >3.7, correct?
> > 
> 
> Is there a way to force this at mkfs time?  I.e. "I know I may want to
> expand this filesystem beyond the 16 TB point?"

Hi Peter,

You could use 'mkfs.ext4 -O 64bit' to force enable 64bit support.  In
addition, we will enable this feature by default.  Lukas has a patch to
fix it.  Here is the link [1].

1. http://patchwork.ozlabs.org/patch/253234/

Regards,
                                                - Zheng
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