linux-ext4 - Re: >16TB issues

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Message-ID: <4A82CDC8.1040007@redhat.com>
Date:	Wed, 12 Aug 2009 09:12:24 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Justin Maggard <jmaggard10@...il.com>
CC:	linux-ext4@...r.kernel.org
Subject: Re: >16TB issues

Justin Maggard wrote:
> On Tue, Aug 11, 2009 at 9:21 PM, Eric Sandeen<sandeen@...hat.com> wrote:
>>> -  Immediately running e2fsck on the volume before ever mounting it
>>> will not complete, and results in the following:
>>> # e2fsck -n /dev/md2
>>> e2fsck 1.41.7 (29-June-2009)
>>> Error reading block 2435874816 (Attempt to read block from filesystem
>>> resulted in short read).  Ignore error? no
>> This is roughly halfway through the filesystem; the journal is roughly
>> in the middle of the filesystem; this is just over 2^31 blocks.  I bet
>> there are still ints or longs in the userspace journal code.  I'll take
>> a look.
> 
> Thanks for looking into this.  That log message is from when I was
> running a 32-bit kernel,

oh!  ok I missed that tidbit.   Although even full 32-bit should be able
to reach 16T at least.  Hmmm

>  and I was apparently running into page cache
> index limitations.  That error went away when I switched to a x86_64
> kernel, but there are still other errors, as posted in one of my more
> recent messages.

Guess I need to catch up a bit.  :)

-Eric

p.s. I ws wrong about the 73G lifetime writes; just mkfsing a 19T
filesystem even w/ lazy_itable_init=1, it did 351G of writes at mkfs
time so that's not it.

> -Justin

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